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                                FORM 10-Q


                    SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, D.C.  20549

(Mark One)

(X)  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
     OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2000

                                    OR

(  ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
     OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ________________ to ________________

Commission file number 0-20299

                SOUTHWEST OIL & GAS 1990-91 INCOME PROGRAM
                Southwest Oil & Gas Income Fund X-C, L.P.
                  (Exact name of registrant as specified
                  in its limited partnership agreement)

Delaware                                    75-2374445
(State or other jurisdiction of                (I.R.S. Employer
incorporation or organization)                Identification No.)


                       407 N. Big Spring, Suite 300
                           Midland, Texas 79701
                 (Address of principal executive offices)

                             (915) 686-9927
                     (Registrant's telephone number,
                           including area code)

Indicate  by  check  mark  whether registrant (1)  has  filed  all  reports
required to be filed by Section 13 or 15(d) of the Securities Exchange  Act
of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject  to
such filing requirements for the past 90 days:

                            Yes   X   No

        The total number of pages contained in this report is 16.


                     PART I. - FINANCIAL INFORMATION


Item 1. Financial Statements

The  unaudited  condensed financial statements included  herein  have  been
prepared  by  the Registrant (herein also referred to as the "Partnership")
in  accordance  with generally accepted accounting principles  for  interim
financial information and with the instructions to Form 10-Q and Rule 10-01
of Regulation S-X.  Accordingly, they do not include all of the information
and  footnotes  required  by generally accepted accounting  principles  for
complete   financial  statements.   In  the  opinion  of  management,   all
adjustments necessary for a fair presentation have been included and are of
a  normal  recurring nature.  The financial statements should  be  read  in
conjunction with the audited financial statements and the notes thereto for
the  year ended December 31, 1999 which are found in the Registrant's  Form
10-K  Report  for  1999 filed with the Securities and Exchange  Commission.
The December 31, 1999 balance sheet included herein has been taken from the
Registrant's  1999 Form 10-K Report.  Operating results for the  three  and
six month periods ended June 30, 2000 are not necessarily indicative of the
results that may be expected for the full year.


                Southwest Oil & Gas Income Fund X-C, L.P.

                              Balance Sheets


                                                 June 30,      December 31,
                                                   2000            1999
                                                ---------      ------------
                                               (unaudited)
  Assets

Current assets:
 Cash and cash equivalents                   $     48,828          26,435
 Receivable from Managing General Partner          98,918         122,710
                                                ---------       ---------
    Total current assets                          147,746         149,145
                                                ---------       ---------
Oil and gas properties - using the
 full cost method of accounting                 2,395,866       2,396,912
  Less accumulated depreciation,
   depletion and amortization                   2,062,496       2,045,496
                                                ---------       ---------
    Net oil and gas properties                    333,370         351,416
                                                ---------       ---------
                                             $    481,116         500,561
                                                =========       =========
  Liabilities and Partners' Equity

Partners' equity:
 General partners                            $    (6,950)         (6,705)
 Limited partners                                 488,066         507,266
                                                ---------       ---------
    Total partners' equity                        481,116         500,561
                                                ---------       ---------
                                             $    481,116         500,561
                                                =========       =========



                Southwest Oil & Gas Income Fund X-C, L.P.

                         Statements of Operations
                               (unaudited)


                                 Three Months Ended      Six Months Ended
                                       June 30,              June 30,
                                    2000      1999        2000      1999

  Revenues

Oil and gas                   $   203,241    169,301    424,486    288,601
Interest                              607        237      1,065        452
                                  -------    -------    -------    -------
                                  203,848    169,538    425,551    289,053
                                  -------    -------    -------    -------

  Expenses

Production                        148,873    149,561    307,236    273,785
General and administrative         10,334     11,249     20,760     22,319
Depreciation, depletion and
 amortization                       4,000     13,000     17,000     34,000
                                  -------    -------    -------    -------
                                  163,207    173,810    344,996    330,104
                                  -------    -------    -------    -------
Net income (loss)             $    40,641    (4,272)     80,555   (41,051)
                                  =======    =======    =======    =======
Net income (loss) allocated to:

 Managing General Partner     $     4,018        786      8,780      (635)
                                  =======    =======    =======    =======
 General Partner              $       446         87        975       (70)
                                  =======    =======    =======    =======
 Limited Partners             $    36,177    (5,145)     70,800   (40,346)
                                  =======    =======    =======    =======
  Per limited partner unit    $      5.79      (.82)      11.34     (6.46)
                                  =======    =======    =======    =======


                Southwest Oil & Gas Income Fund X-C, L.P.

                         Statements of Cash Flows
                               (unaudited)


                                                        Six Months Ended
                                                             June 30,
                                                          2000      1999

Cash flows from operating activities:

 Cash received from sale of oil and gas             $   428,316    274,202
 Cash paid to suppliers                               (308,034)  (273,867)
 Interest received                                        1,065        452
                                                        -------    -------
  Net cash provided by operating activities             121,347        787
                                                        -------    -------
Cash flows from investing activities:

 Additions to oil and gas properties                          -      (707)
 Cash received from sale of oil and gas
  properties                                              1,046     18,643
                                                        -------    -------
  Net cash provided by investing activities:              1,046     17,936
                                                        -------    -------
Cash flows used in financing activities:

 Distributions to partners                            (100,000)   (23,122)
                                                        -------    -------
Net increase (decrease) in cash and cash equivalents     22,393   (4,399)

 Beginning of period                                     26,435     22,818
                                                        -------    -------
 End of period                                      $    48,828     18,419
                                                        =======    =======
                                                               (continued)


                Southwest Oil & Gas Income Fund X-C, L.P.

                   Statements of Cash Flows, continued
                               (unaudited)

                                                        Six Months Ended
                                                             June 30,
                                                          2000      1999
Reconciliation of net income (loss) to net
 cash provided by operating activities:

Net income (loss)                                   $    80,555   (41,051)

Adjustments to reconcile net income (loss) to
 net cash provided by operating activities:

  Depreciation, depletion and amortization               17,000     34,000
  Decrease (increase) in receivables                      3,830   (14,399)
  Increase in payables                                   19,962     22,237
                                                        -------    -------
Net cash provided by operating activities           $   121,347        787
                                                        =======    =======


                Southwest Oil & Gas Income Fund X-C, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


1.   Organization
     Southwest Oil & Gas Income Fund X-C, L.P. was organized under the laws
     of  the  state of Delaware on September 20, 1991, for the  purpose  of
     acquiring  producing oil and gas properties and to produce and  market
     crude oil and natural gas produced from such  properties for a term of
     50  years, unless terminated at an earlier date as provided for in the
     Partnership  Agreement.   The  Partnership  sells  its  oil  and   gas
     production  to  several purchasers with the prices it  receives  being
     dependent  upon  the oil and gas economy.  Southwest  Royalties,  Inc.
     serves as the Managing General Partner and H. H.  Wommack, III, as the
     individual   general  partner.   Revenues,  costs  and  expenses   are
     allocated as follows:

                                                     Limited      General
                                                     Partners     Partners
                                                     --------     --------
     Interest income on capital contributions        100%            -
     Oil and gas sales                                90%          10%
     All other revenues                               90%          10%
     Organization and offering costs (1)             100%            -
     Syndication costs                               100%            -
     Amortization of organization costs              100%            -
     Property acquisition costs                      100%            -
     Gain/loss on property disposition                90%          10%
     Operating and administrative costs (2)           90%          10%
     Depreciation, depletion and amortization
      of oil and gas properties                      100%            -
     All other costs                                  90%          10%

          (1)   All  organization costs in excess of 3% of initial  capital
          contributions  will be paid by the Managing General  Partner  and
          will  be treated as a capital contribution.  The Partnership paid
          the  Managing  General Partner an amount equal to 3%  of  initial
          capital contributions for such organization costs.

          (2)   Administrative costs in any year which exceed 2% of capital
          contributions shall be paid by the Managing General  Partner  and
          will be treated as a capital contribution.

2.   Summary of Significant Accounting Policies
     The  interim  financial information as of June 30, 2000, and  for  the
     three  and  six  months  ended June 30, 2000, is  unaudited.   Certain
     information  and footnote disclosures normally included  in  financial
     statements  prepared in accordance with generally accepted  accounting
     principles  have been condensed or omitted in this Form 10-Q  pursuant
     to   the   rules  and  regulations  of  the  Securities  and  Exchange
     Commission.   However,  in  the opinion of management,  these  interim
     financial  statements include all the necessary adjustments to  fairly
     present  the  results of the interim periods and all such  adjustments
     are  of a normal recurring nature.  The interim consolidated financial
     statements  should  be read in conjunction with the audited  financial
     statements for the year ended December 31, 1999.


Item 2. Management's  Discussion  and Analysis of Financial  Condition  and
        Results of Operations

General

Southwest  Oil  &  Gas Income Fund X-C, L.P. was organized  as  a  Delaware
limited  partnership on September 20, 1991.  The offering of  such  limited
partnership  interests began October 1, 1991 as part of  a  shelf  offering
registered  under  the  name Southwest Oil & Gas  1990-91  Income  Program.
Minimum  capital requirements for the Partnership were met on  January  13,
1992  and  the  offering  concluded on April 30, 1992  with  total  limited
partner contributions of $3,123,000.

The  Partnership was formed to acquire interests in producing oil  and  gas
properties,  to produce and market crude oil and natural gas produced  from
such properties, and to distribute the net proceeds from operations to  the
limited  and  general partners.  Net revenues from producing  oil  and  gas
properties will not be reinvested in other revenue producing assets  except
to the extent that production facilities and wells are improved or reworked
or  where methods are employed to improve or enable more efficient recovery
of oil and gas reserves.

Increases   or   decreases   in  Partnership   revenues   and,   therefore,
distributions  to partners will depend primarily on changes in  the  prices
received  for  production,  changes in volumes of  production  sold,  lease
operating  expenses, enhanced recovery projects, offset drilling activities
pursuant to farmout arrangements, sales of properties, and the depletion of
wells.  Since wells deplete over time, production can generally be expected
to decline from year to year.

Well  operating costs and general and administrative costs usually decrease
with   production   declines;  however,  these  costs  may   not   decrease
proportionately.  Net income available for distribution to the partners  is
therefore expected to fluctuate in later years based on these factors.

Based  on  current  conditions, management does not  anticipate  performing
workovers  in  the next year.  The Partnership could possibly experience  a
normal decline of 10% to 11%.

Oil and Gas Properties

Oil  and  gas  properties  are accounted for at cost  under  the  full-cost
method.  Under this method, all productive and nonproductive costs incurred
in  connection with the acquisition, exploration and development of oil and
gas  reserves  are capitalized.  Gain or loss on the sale of  oil  and  gas
properties  is not recognized unless significant oil and gas  reserves  are
involved.

The  Partnership's policy for depreciation, depletion and  amortization  of
oil  and  gas  properties is computed under the units  of  revenue  method.
Under the units of revenue method, depreciation, depletion and amortization
is  computed  on  the  basis of current gross revenues from  production  in
relation  to future gross revenues, based on current prices, from estimated
production of proved oil and gas reserves.

Should the net capitalized costs exceed the estimated present value of  oil
and gas reserves, discounted at 10%, such excess costs would be charged  to
current  expense.  As of June 30, 2000, the net capitalized costs  did  not
exceed the estimated present value of the oil and gas reserves.





Results of Operations

A.  General Comparison of the Quarters Ended June 30, 2000 and 1999

The  following  table  provides certain information  regarding  performance
factors for the quarters ended June 30, 2000 and 1999:

                                               Three Months
                                                  Ended          Percentage
                                                 June 30,         Increase
                                              2000       1999    (Decrease)
                                              ----       ----    ----------
Average price per barrel of oil          $    25.97     15.02      73%
Average price per mcf of gas             $     3.19      1.79      78%
Oil production in barrels                     7,500     8,800    (15%)
Gas production in mcf                         9,600    20,800    (54%)
Gross oil and gas revenue                $  203,241   169,301      20%
Net oil and gas revenue                  $   54,368    19,740     175%
Partnership distributions                $   50,000    23,204     115%
Limited partner distributions            $   45,000    22,704      98%
Per unit distribution to limited
 partners                                $     7.20      3.63      98%
Number of limited partner units               6,246     6,246

Revenues

The  Partnership's oil and gas revenues increased to $203,241 from $169,301
for the quarters ended June 30, 2000 and 1999, respectively, an increase of
20%.   The principal factors affecting the comparison of the quarters ended
June 30, 2000 and 1999 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    increased  during the quarter ended June 30, 2000 as  compared  to  the
    quarter ended June 30, 1999 by 73%, or $10.95 per barrel, resulting  in
    an   increase  of  approximately  $96,400  in  revenues.    Oil   sales
    represented  86%  of total oil and gas sales during the  quarter  ended
    June  30,  2000  as compared to 78% during the quarter ended  June  30,
    1999.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    increased during the same period by 78%, or $1.40 per mcf, resulting in
    an increase of approximately $29,100 in revenues.

    The  total  increase in revenues due to the change in  prices  received
    from  oil  and  gas production is approximately $125,500.   The  market
    price for oil and gas has been extremely volatile over the past decade,
    and  management expects a certain amount of volatility to  continue  in
    the foreseeable future.


2.  Oil  production decreased approximately 1,300 barrels or 15% during the
    quarter  ended June 30, 2000 as compared to the quarter ended June  30,
    1999, resulting in a decrease of approximately $33,800 in revenues.

    Gas  production  decreased approximately 11,200 mcf or 54%  during  the
    same  period,  resulting  in  a decrease of  approximately  $35,700  in
    revenues.

    The  total  decrease  in revenues due to the change  in  production  is
    approximately $69,500.  The decrease in gas production is primarily due
    to  a  non-operated gas well. The operator performed a workover  during
    the  last quarter of 1999, which was not only unsuccessful, but  caused
    the  well  to  shut down.  The well is not believed to be  recoverable,
    thus  the loss to the Partnership is considered to be permanent.   This
    well represented approximately 2,600 mcf a month to the Partnership.

Costs and Expenses

Total  costs  and  expenses decreased to $163,207  from  $173,810  for  the
quarters ended June 30, 2000 and 1999, respectively, a decrease of 6%.  The
decrease  is  the  result  of  lower general and administrative,  depletion
expense and lease operating expense.

1.  Lease   operating  costs  and  production  taxes  were  1%  lower,   or
    approximately  $700  less during the quarter ended  June  30,  2000  as
    compared to the quarter ended June 30, 1999.

2.  General and administrative costs consist of independent accounting  and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner personnel costs.  General and administrative costs decreased 8%
    or  approximately  $900  during the quarter  ended  June  30,  2000  as
    compared to the quarter ended June 30, 1999.

3.  Depletion  expense decreased to $4,000 for the quarter ended  June  30,
    2000  from  $13,000  for the same period in 1999.   This  represents  a
    decrease  of 69%.  Depletion is calculated using the units  of  revenue
    method  of  amortization based on a percentage of current period  gross
    revenues  to  total future gross oil and gas revenues, as estimated  by
    the  Partnership's  independent  petroleum  consultants.   Contributing
    factors  to  the  decline in depletion expense between the  comparative
    periods were the increase in the price of oil and gas used to determine
    the Partnership's reserves for July 1, 2000 as compared to 1999.


B.   General  Comparison of the Six Month Periods Ended June 30,  2000  and
1999

The  following  table  provides certain information  regarding  performance
factors for the six month periods ended June 30, 2000 and 1999:

                                                Six Months
                                                  Ended          Percentage
                                                 June 30,         Increase
                                              2000       1999    (Decrease)
                                              ----       ----    ----------

Average price per barrel of oil          $    25.73     12.17     111%
Average price per mcf of gas             $     3.54      1.69     109%
Oil production in barrels                    15,300    18,000    (15%)
Gas production in mcf                         8,700    41,000    (79%)
Gross oil and gas revenue                $  424,486   288,601      47%
Net oil and gas revenue                  $  117,250    14,816     691%
Partnership distributions                $  100,000    23,204     331%
Limited partner distributions            $   90,000    22,704     296%
Per unit distribution to limited
 partners                                $    14.41      3.63     296%
Number of limited partner units               6,246     6,246

Revenues

The  Partnership's oil and gas revenues increased to $424,486 from $288,601
for  the six months ended June 30, 2000 and 1999, respectively, an increase
of  47%.  The principal factors affecting the comparison of the six  months
ended June 30, 2000 and 1999 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    increased during the six months ended June 30, 2000 as compared to  the
    six months ended June 30, 1999 by 111%, or $13.56 per barrel, resulting
    in  an  increase  of  approximately $244,100 in  revenues.   Oil  sales
    represented 93% of total oil and gas sales during the six months  ended
    June  30, 2000 as compared to 76% during the six months ended June  30,
    1999.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    increased  during the same period by 109%, or $1.85 per mcf,  resulting
    in an increase of approximately $75,900 in revenues.

    The  total  increase in revenues due to the change in  prices  received
    from  oil  and  gas production is approximately $320,000.   The  market
    price for oil and gas has been extremely volatile over the past decade,
    and  management expects a certain amount of volatility to  continue  in
    the foreseeable future.


2.  Oil  production decreased approximately 2,700 barrels or 15% during the
    six months ended June 30, 2000 as compared to the six months ended June
    30, 1999, resulting in a decrease of approximately $69,500 in revenues.

    Gas  production  decreased approximately 32,300 mcf or 79%  during  the
    same  period,  resulting  in  a decrease of approximately  $114,300  in
    revenues.

    The  total  decrease  in revenues due to the change  in  production  is
    approximately  $183,800.  The Partnership's  dramatic  decline  in  gas
    production  was primarily in connection with two wells.   During  1999,
    the  Partnership was involved in a lawsuit in order to receive  payment
    for  two  months  of production from the purchaser at  that  time.  The
    lawsuit  was settled in the current year with the Partnership receiving
    less  than was owed from the purchaser.  The original accrual  recorded
    during  the  second quarter of 1999 was reversed in the  current  year.
    This  reversal represented approximately 2,800 mcf.  Additionally,  the
    partnership was informed during the current year that a workover  which
    was  performed  during the last quarter of 1999 on a non-operated  well
    was  not only unsuccessful but caused the well to shut down.  This well
    is  not believed to be recoverable, thus the loss to the Partnership is
    considered to be permanent.  This well represented approximately  2,770
    mcf  a  month.  Total decline for the partnership during the six months
    ended  June  30,  2000  in connection with this non-operated  well  was
    approximately 24,900 mcf.

Costs and Expenses

Total  costs and expenses increased to $344,996 from $330,104 for  the  six
months ended June 30, 2000 and 1999, respectively, an increase of 5%.   The
increase is the result of a higher lease operating costs, partially  offset
by a decrease in general and administrative expense and depletion expense.

1.  Lease  operating  costs  and  production  taxes  were  12%  higher,  or
    approximately $33,500 more during the six months ended June 30, 2000 as
    compared to the six months ended June 30, 1999.

2.  General and administrative costs consist of independent accounting  and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner personnel costs.  General and administrative costs decreased 7%
    or  approximately $1,600 during the six months ended June 30,  2000  as
    compared to the six months ended June 30, 1999.

3.  Depletion  expense decreased to $17,000 for the six months  ended  June
    30,  2000 from $34,000 for the same period in 1999.  This represents  a
    decrease  of 50%.  Depletion is calculated using the units  of  revenue
    method  of  amortization based on a percentage of current period  gross
    revenues  to  total future gross oil and gas revenues, as estimated  by
    the  Partnership's  independent  petroleum  consultants.   Contributing
    factors  to  the  decline in depletion expense between the  comparative
    periods were the increase in the price of oil and gas used to determine
    the Partnership's reserves for July 1, 2000 as compared to 1999.


Liquidity and Capital Resources

The  primary source of cash is from operations, the receipt of income  from
interests in oil and gas properties.  The Partnership knows of no  material
change, nor does it anticipate any such change.

Cash flows provided by operating activities were approximately $121,300  in
the six months ended June 30, 2000 as compared to approximately $800 in the
six  months ended June 30, 1999.  The primary source of the 2000 cash  flow
from operating activities was profitable operations.

Cash  flows provided by investing activities were approximately  $1,000  in
the six months ended June 30, 2000 as compared to approximately $17,900  in
the  six months ended June 30, 1999.  The principle source of the 2000 cash
flow from investing activities was the sale of oil and gas properties.

Cash flows used in financing activities were approximately $100,000 in  the
six  months ended June 30, 2000 as compared to approximately $23,100 in the
six  months ended June 30, 1999.  The only use in financing activities  was
the distributions to partners.

Total distributions during the six months ended June 30, 2000 were $100,000
of which $90,000 was distributed to the limited partners and $10,000 to the
general partners.  The per unit distribution to limited partners during the
six  months ended June 30, 2000 was $14.41. Total distributions during  the
six  months  ended  June  30,  1999  were  $23,204  of  which  $22,704  was
distributed to the limited partners and $500 to the general partners.   The
per  unit distribution to limited partners during the six months ended June
30, 1999 was $3.63.

The  source  for  the  2000  distributions of  $100,000  was  oil  and  gas
operations  of  approximately  $121,300 and  the  change  in  oil  and  gas
properties   of  approximately  $1,000,  resulting  in  excess   cash   for
contingencies  or  subsequent  distributions.   The  source  for  the  1999
distributions of $23,204 was oil and gas operations of approximately  $800,
and the net change in oil and gas properties of approximately $17,900, with
the balance from available cash on hand at the beginning of the period.

Since  inception of the Partnership, cumulative monthly cash  distributions
of  $3,137,022  have  been made to the partners.   As  of  June  30,  2000,
$2,842,148 or $455.03 per limited partner unit has been distributed to  the
limited partners, representing a 91% return of the capital contributed.

As  of June 30, 2000, the Partnership had approximately $147,700 in working
capital.   The  Managing  General Partner knows of no  unusual  contractual
commitments  and  believes  the  revenues  generated  from  operations  are
adequate to meet the needs of the Partnership.


Liquidity - Managing General Partner

The  Managing General Partner has a highly leveraged capital structure with
over  $50.1  million principal due by December 31, 2000 and  $15.3  million
interest   payments  due  within  the  next  twelve  months  on  its   debt
obligations.  The Managing General Partner is currently in the  process  of
renegotiating  the  terms  of its various obligations  with  its  creditors
and/or  attempting to seek new lenders or equity investors.   Additionally,
the Managing General Partner would consider disposing of certain assets  in
order to meet its obligations.

There  can  be  no  assurance  that  the Managing  General  Partner's  debt
restructuring efforts will be successful or that the lenders will agree  to
a   course   of  action  consistent  with  the  Managing  General  Partners
requirements  in restructuring the obligations.  Even if such agreement  is
reached,  it  may  require approval of additional  lenders,  which  is  not
assured.  Furthermore, there can be no assurance that the sales  of  assets
can  be  successfully  accomplished on terms  acceptable  to  the  Managing
General   Partner.   Under  current  circumstances,  the  Managing  General
Partner's  ability to continue as a going concern depends upon its  ability
to  (1)  successfully  restructure  its obligations  or  obtain  additional
financing  as  may  be  required, (2) maintain  compliance  with  all  debt
covenants, (3) generate sufficient cash flow to meet its obligations  on  a
timely  basis, and (4) achieve satisfactory levels of future earnings.   If
the  Managing  General Partner is unsuccessful in its efforts,  it  may  be
unable to meet its obligations making it necessary to undertake such  other
actions as may be appropriate to preserve asset values.




                       PART II. - OTHER INFORMATION


Item 1.   Legal Proceedings

          None

Item 2.   Changes in Securities

          None

Item 3.   Defaults Upon Senior Securities

          None

Item 4.   Submission of Matter to a Vote of Security Holders

          None

Item 5.   Other Information

          None

Item 6.   Exhibits and Reports on Form 8-K

          (a) Exhibits:

               27 Financial Data Schedule

               (b)  Reports on Form 8-K:

                     No  reports on Form 8-K were filed during the  quarter
               ended June 30, 2000.


                                SIGNATURES


Pursuant  to the requirements of the Securities Exchange Act of  1934,  the
registrant  has duly caused this report to be signed on its behalf  by  the
undersigned thereunto duly authorized.

                                 SOUTHWEST OIL & GAS
                                 INCOME FUND X-C, L.P.
                                 a Delaware limited partnership


                                 By:   Southwest Royalties, Inc.
                                       Managing General Partner


                              By:  /s/ J Steven Person
                                   ------------------------------
                                   J Steven Person, Vice-President of
                                   Marketing and Chief Financial Officer
                                   of Southwest Royalties, Inc.
                                   the Managing General Partner

Date: August 15, 2000