United States Steel Corporation     Robert M. Stanton
               Law Department                      Assistant General Counsel -
               600 Grant Street                    Corporate & Assistant
               Pittsburgh, PA  15219-2800          Secretary
               412 433 2877
               Fax: 412 433 2811
               email:  rmstanton@uss.com



CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED PURSUANT TO 17 C.F.R.  Sec. 200.83.
THIS LETTER OMITS CONFIDENTIAL INFORMATION INCLUDED IN THE UNREDACTED VERSION
OF THE LETTER  THAT  WAS  DELIVERED TO THE DIVISION OF CORPORATION FINANCE,
AND  THESE OMISSIONS ARE DENOTED WITH ASTERISKS.



                                                     October 4, 2006



Mr. Jeffrey Gordon
Staff Accountant
Division of Corporation Finance
Securities and Exchange Commission
100 F Street N.E.
Washington, DC 20549

Re:  United States Steel Corporation Form 10-K for year ended December 31, 2005
     and Forms 10-Q for Quarters ended March 31 and June 30, 2006
     File No. 1-16811

Dear Mr. Gordon:

For  the  reasons  articulated  in our letter dated  today  to  the  Freedom  of
Information Office, confidential treatment is sought for the marked portions  of
this letter pursuant to 17 C.F.R. Sec. 200.83. The information in those portions
of  this  letter  are treated confidentially by United States Steel  Corporation
("U. S. Steel") in the regular course of its business and disclosure of it would
adversely  impact  U.  S. Steel's competitive position and  ability  to  resolve
matters with the lowest cost to our stockholders.

In  response to the letter from John Hartz dated September 20, 2006, U. S. Steel
is pleased to voluntarily provide the following responses and information to the
staff  of  the  Securities  and  Exchange Commission  (the  "Commission").   For
convenience,  we have reproduced each of your comments below in italics  in  the
order  in  which  it appeared in your letter, and our response to  each  comment
immediately follows it.

  (a)  We note from page 30 that your results of operations and cash flows for a
given  period  could be adversely affected by asbestos-related lawsuits.  It  is
unclear  why  you  do  not  consider  your estimates  surrounding  the  asbestos
liability to be critical.  Please advise.

    RESPONSE:  Page 30 of the Form 10-K contains the following statement:

      "Despite  this  uncertainty, and although U. S. Steel's  results  of
      operations  and  cash flows for a given period  could  be  adversely
      affected  by  asbestos-related  lawsuits,  claims  and  proceedings,
      management  believes that the ultimate resolution of  these  matters
      will  not  have a material adverse effect on the Company's financial
      condition."

    The foregoing statement must be read in the context of the highly cyclical
    nature of the steel industry.   U. S. Steel has experienced quarters  with
    minimal  net income.  In 2002, for example, net income was $27 million  in
    the  second  quarter and $11 million in the fourth quarter.  We  therefore
    thought  it  appropriate  to caution the reader about  the  potential  for
    impacts  on  our  quarterly results of operations and  cash  flows,  while
    indicating  that  we  do  not believe that there will  be  a  longer  term
    material impact on our financial condition.

    U.  S.  Steel identifies "potential litigation claims and settlements"  as
    one  of  several  accounting estimates in the first  paragraph  under  the
    heading  "Critical Accounting Estimates" on page 39 of the Form 10-K.   In
    that  section  of  the  Form 10-K, we discuss  in  more  detail  the  most
    significant  estimates and judgments that are used in the  preparation  of
    our  financial  statements. They are (i) pensions  and  OPEB;  (ii)  asset
    impairments, (iii) taxes and (iv) environmental remediation.  We  did  not
    include  asbestos  related  lawsuits in this  list  because  our  asbestos
    reserves  and  historical costs represent only  a  tiny  fraction  of  the
    amounts  involved in the other enumerated matters.  In addition, estimates
    for  any  litigation, not just asbestos, are dependent upon the facts  and
    circumstances  of each particular case.  Our counsel separately  evaluates
    each  case, making specific judgments as to many matters that do not  have
    general  applicability, such as credibility of witnesses,  medical  costs,
    other   damages  and  settlement  and  verdict  amounts   in   the   trial
    jurisdiction.

  (b)  Please provide us with a company-wide roll-forward of your asbestos
related liability for all periods presented. Show beginning and ending balances,
expenses,  expenditures  and  changes  in  estimates,  separately.   Provide  a
narrative  explaining the activity.  Explain how you account for your legal and
administrative costs related to asbestos and quantify that activity also.

    RESPONSE:   U.  S.  Steel discloses on an annual and quarterly  basis  the
    number  of claims filed, the number of claims resolved through settlement,
    the number of claims resolved without payment and aggregate payments made.
    This  information  is repeated in the following table  together  with  the
    accrual and expenditure information you requested.  *****



          Estimated Number of  Asbestos Claims
        ----------------------------------------
                                        YTD June
                     2004      2005       2006
                    ------    ------    --------
        Number of
        Claims at   14,835    10,999      8,399
        Beginning
        of Period

        Number of
        Claims       5,300     3,800      4,736
        Resolved
        During
        Period

        Number of
        Claims       1,464     1,200       389
        Filed
        During
        Period

        Number of
        Claims at   10,999     8,399      4,052
        End of
        Period


           Asbestos   Liability   Accruals   (in Millions)
        ----------------------------------------------------
                                                    YTD June
                                 2004      2005       2006
                                 ----      ----     --------
        Beginning Balance
                                  **        **         **
        Plus: Accrual
        Additions/(Reductions)    **        **        **(i)

        Less: Payments            $15       $11        $2

        Ending Balance            **        **         **

       (i)  *****

    In  order  to  better understand the methodology we use to  calculate  our
    reserve  we refer to our disclosure on page 29 of the Form 10-K  where  we
    state:

      "Many of these cases involve multiple defendants (typically from fifty
      to   more   than  one  hundred  defendants).  More  than   8,000,   or
      approximately 95 percent, of these claims are pending in jurisdictions
      which permit filings with massive numbers of plaintiffs. Based upon
      U. S. Steel's experience in such cases, it believes  that  the  actual
      number of plaintiffs who ultimately assert claims against U. S.  Steel
      will likely be a small fraction of the total number of plaintiffs."

    For  example, based on our experience, a mass filing might plead that  (i)
    each  of  the following 1,000 or so named persons was exposed to asbestos,
    (ii)   each  of  them  suffers  from  one  or  more  conditions  including
    mesothelioma, lung cancer, asbestosis, pleural disease or some other  lung
    condition,  and  (iii)  each contracted this condition  due  to  exposures
    caused  by  one or more of the 50 to 100 defendants named.  The  threshold
    issue  therefore is to determine which of these plaintiffs, if  any,  have
    any  evidence of exposure related to U. S. Steel.  As we state in the Form
    10-K, ultimately most of the plaintiffs have no such evidence.  In several
    of  these  mass  plaintiff jurisdictions, discovery is stayed,  often  for
    years,  until the court sets some or all of the claims for trial.   During
    such  stay it is difficult or impossible to determine which claims  relate
    to U. S. Steel.

    U. S. Steel accrues for asbestos claims in the following manner.  *******

    Concerning legal costs, outside counsel generally bills monthly and  bills
    are  paid within 30 days or less.  We accrue unpaid bills as well  as  our
    estimate  of unbilled work that has been performed.  U. S. Steel does  not
    track  internal  time spent on, or otherwise allocate internal  costs  to,
    specific  legal  matters.  The following table shows our  outside  counsel
    expenditures for asbestos cases during the relevant time periods:

          Outside Counsel Expenses for Asbestos Cases (in Millions)
        -----------------------------------------------------------
                                        YTD June
                     2004      2005       2006
                     ----      ----     --------
        Expenses
        During        **        **         **
        Period


  (c)  In the context of the Business section, it is unclear why you only
mention the $8 million expense associated with USSK, and make no mention of
the  $49 million total company expense in the same context.  See page 19.

    RESPONSE:  This disclosure began in 2001 in order to give some context  to
    the  extent  of  our environmental expenditures related to  our  Slovakian
    operations, which we had acquired in November 2000.  In future filings, we
    will  include a discussion of our total environmental remediation expense,
    as well as our total environmental accrual, in this section.

  (d)  On page 32 under the paragraph "Other Remediation Sites" you indicate
that one site may exceed $25 million, however both Gary and Geneva indicate
costs  in excess of $25 million.

    RESPONSE: The reference on page 32 to a site which may exceed $25  million
    is  to  the  Geneva Site.  Although the aggregate costs  of  the  separate
    matters  discussed under the caption "Gary Works" exceed $25  million,  we
    treat  those  separate matters as individual sites  because  each  is  the
    subject  of  a  separate order that is issued under  the  authority  of  a
    different statute and administered by a different governmental agency.  We
    will  change future filings in a manner that will eliminate this potential
    confusion.

  (e)  Since you have included the RCRA Corrective Action Program at Gary Works,
Fairfield Works, and Elizabeth, PA as your "material" sites as described on F-53
and indicated that an additional $40 million may be incurred at those sites,  it
would  appear  appropriate and consistent to include  the  range  of  reasonably
possible additional losses associated with each individual site.

    RESPONSE:   We  do  not  possess  the detailed  information  necessary  to
    estimate possible additional losses on a site-by-site basis because of the
    numerous  uncertainties inherent in environmental remediation  activities,
    including  the nature and extent of the contamination, the extent  of  the
    required  cleanup, the widely varying costs of alternate  cleanup  methods
    and  unanticipated findings as cleanup activities progress.  Our statement
    on  page F-53 that additional liabilities could "range in the aggregate up
    to  100 percent of the accrued liabilities" is based on our experience  in
    dealing  with  remediation activities of this type.   Cost  estimates  are
    inherently imprecise, and we believe that it is helpful to the  reader  to
    at least understand the order of magnitude of deviation that may occur for
    these "material" sites.  The potential aggregate range would appear to  be
    more  meaningful in the context of an investment in U.S.  Steel  than  the
    accumulation of range maximums for the individual sites.

  (f)   It  is unclear whether Geneva Works is one of the "four" material sites.
There are only three mentioned in the second paragraph.  Please clarify.  If so,
it  would  appear appropriate and consistent to include the range of  reasonably
possible additional losses associated with Geneva Works on page 35.  Further, if
Geneva  is one of the four, the disclosure in the fourth sentence of the  second
paragraph  on page F-53 does not appear to encompass Geneva.  If Geneva  is  not
one of the four, please identify the fourth site.

    RESPONSE:  Geneva Works was one of the four sites referred to in the  second
    paragraph  on  page  F-53  and was intended to  be  encompassed  within  the
    disclosure  in the fourth sentence of the second paragraph.  However,  as  a
    result of the $25 million accrual recorded in the fourth quarter of 2005 and
    additional  information  obtained  regarding  the  Geneva  Works  site,   we
    concluded  during  our assessment for the first quarter  of  2006  that  the
    uncertainty  and potential for additional material losses for this  site  no
    longer  existed.    Consequently, the disclosure in our Form  10-Q  for  the
    first  quarter  of  2006 refers to only three sites (Gary  Works,  Fairfield
    Works,  and  the Municipal Industrial & Disposal Superfund site)  for  which
    there  is  the potential for additional material losses.  We disclosed  that
    the  accrued  liabilities  for these three sites  totaled  $16  million  and
    additional  losses could range up to 100% of the accrued  liabilities.   The
    Geneva  Works  site  is  discussed in the subsequent  paragraph.  In  future
    filings we will move the discussion of the Geneva Works site to be in  close
    proximity to our discussion of other mature major sites that do not have the
    potential for additional material losses.

  (g)   On  page 35 you indicate that the remaining costs associated with Geneva
Works are $29.4 million.  On page F-53, it is $26 million.

    RESPONSE:   As  the language in our Form 10-K indicates, the  $26  million
    amount shown on page F-53 includes only remediation costs while the  $29.4
    million amount shown on page 35 includes both remediation costs and  post-
    closure  care costs.  We will change future disclosures to eliminate  this
    potential confusion.

  (h)  Under Critical Accounting Estimates, you should quantify the dollar
amount of the range of reasonably possible additional loss related to all
environmental liabilities, as this is the disclosure discussing your critical
estimates.

    RESPONSE:  See our response to comment (e).

  (i)  In future filings, if material, you should discuss the underlying reasons
for  the amount of environmental expense each period.  For example, although you
disclose  the $49 million charge in 2005, you do not explain what the underlying
triggering  events  (estimate changes, new sites, new  discovered  issues)  that
caused  you to record that amount.  In addition you should disclose prior  years
for comparison and provide narrative context on future expectations.

    RESPONSE:    Estimate changes, new sites and newly discovered  issues  are
    among  the reasons for period to period changes in environmental  expense.
    Others  include  new  legal  or  regulatory requirements,  contractor  and
    equipment  availability, weather conditions and agency  responses  to  our
    submissions.  In our future filings, we will discuss any material  reasons
    for  changes to environmental expense.  Also see our response  to  comment
    (j) below.

  (j)  Please provide us with a company-wide roll-forward of accrued
environmental expenses for all periods presented. Show beginning and ending
balances, expenses, expenditures and changes in estimates,  separately.
Provide a narrative explaining the activity.

    RESPONSE:   Accrued  liabilities for remediation activities  totaled  $145
    million  at  December  31, 2005, of which $26 million  was  classified  as
    current,  and $123 million at December 31, 2004, of which $21 million  was
    classified  as  current.   Please refer to the  Environmental  Proceedings
    section  of  the  Form 10-K at pages 31-35 for further discussion  of  the
    status  and reasons for the changes in the accrual from period to  period.
    Set  forth  below  is  a  table showing the company-wide  roll-forward  of
    accrued environmental expenses:

       Environmental Remediation Liability (in millions)
       -------------------------------------------------
                                        YTD June
                     2004      2005       2006
                     ----      ----     --------
        Beginning
        Balance      $113      $123       $145

        Plus:
        Accrual
        Additions    32(i)    49(iii)     11(v)

        Less:
        Payments
                    22(ii)    27(iv)     11(vi)

        Ending
        Balance       $123      $145      $145

    (i) Composed of many accruals, only one of which was greater than $5 million
        for the Grand Calumet River remediation at Gary Works ($10 million).

   (ii) Composed of many payments, none of which were greater than $5 million.

  (iii) Composed of many accruals only one of which was greater than $5 million
        for the former Geneva Works ($26 million, $20 million of which was
        recorded in the fourth quarter).

   (iv) Composed of many payments, only one of which was greater than $5 million
        for the Gary Works natural resource damages along the east branch of the
        Grand Calumet River and Indiana Harbor Canal.

    (v) Composed of many accruals, none of which were greater than $5 million.

   (vi) Composed of many payments, none of which were greater than $5 million.



  (k)   On page F-53 it is unclear whether the $52 million accrual for legal and
administrative costs is included in the $145 million total, or is in addition to
that amount.

    RESPONSE:  The first paragraph of page F-53 of the Form 10-K contains  the
    following sentence:

      "As  of  December 31, 2005, a total of $52 million was  accrued  for
      legal  and  administrative  costs and for  post  closure  costs  for
      various  landfills  closed  under  the  Resource  Conservation   and
      Recovery  Act  (RCRA); for two [Natural] Resource Damage  claims  at
      Gary Works; and for the completion of projects for the Grand Calumet
      River  dredging  and the related Corrective Action  Management  Unit
      (CAMU)."

    This  portion of our disclosure recaps the status of mature,  major  sites
    where  we  do  not  expect  significant additional  accruals.   Legal  and
    administrative costs are a small part of the $52 million, as discussed  in
    our  response  to comment (l) below.  The $52 million is included  in  the
    $145  million total.  We will clarify this in future disclosures in  order
    to avoid confusion.

  (l)   Provide us with a comprehensive accounting policy for any and all  legal
fees.  In  other words do you accrue legal fees when probable and estimable,  or
expense  when incurred, or both?  If both, explain how you differentiate between
accruing  legal  fees and expensing when incurred.  Tell us  whether  there  are
legal  fees accrued other than the $52 million related to the other sites.   Are
the  expected  legal fees for all other sites accrued, and if so  quantify  such
amounts for us.  If they are not, explain why the accounting is different.

    RESPONSE:   Our accounting policy for legal fees is consistent  with  that
    for  other services that are provided.  We expense all billed charges  and
    accrue  for  unbilled charges for services that have been  provided.   The
    exception is for legal and administrative charges related to environmental
    remediation  liabilities.  SOP 96-1 requires accrual  of  expected  future
    costs for legal and administrative costs to support this activity.  Of the
    $52  million accrual, only about 10% is for legal and administrative costs
    related to environmental remediation liabilities, as required under SOP 96-
    1.    Total   legal   fees  for  all  matters,  including   asbestos   and
    environmental, have not been material, and we do not expect them to become
    material in the future.

  (m)   It  is  unclear whether you consider your legal accruals to be  critical
estimates. In this regard, please provide us with a company-wide roll-forward of
accrued  legal  expenses for all periods presented.  Show beginning  and  ending
balances, expenses, expenditures and changes in estimates, separately. Provide a
narrative explaining the activity.

    RESPONSE: Our accrued expenses for legal services are not material, and we
    do  not consider them to be critical estimates.  Our SOP 96-1 accrual  for
    future  legal  services  is  rather static and is  evaluated  each  fourth
    quarter unless a significant event occurs during the year.  Also note that
    the  $52  million accrual is included in the roll-forward of environmental
    liabilities provided in our response to comment (j).

  (n)   On  page F-53 you mention that it is reasonably possible that additional
costs  could  be material at the Fairfield Works location.  Your description  of
this site on page 33 provides very little context as to its materiality.

    RESPONSE:  The disclosure on page 33 addresses currently ongoing  activity
    at  Fairfield  Works. The RCRA corrective action program is  at  an  early
    stage.   As  we disclose on page 33, we submitted the first RCRA  Facility
    Investigation (RFI) report in February 2005, and are still awaiting agency
    response.   Any disclosure about agency reaction or concerning  additional
    RFI  matters  would  be  pure speculation.  In  future  filings,  we  will
    identify in the Legal Proceedings section (as we have already done in  the
    Contingency  footnote)  those sites at which  additional  costs  could  be
    material  (including the Fairfield site). We provide an  overview  of  our
    environmental exposures on pages 19-21 of the Form 10-K and  in  the  Risk
    Factor on page 24.

  (o)   On page F-53 you mention 4 sites where the additional costs could be
material   and  then  discuss  the  "remaining  45  sites."  This is  unclear,
considering you mention 60 sites on page 24.

    RESPONSE: The environmental risk factor on page 24 states that U. S. Steel
    is  involved  in  approximately 60 remediation projects.   It  includes  a
    general  statement  of the magnitude of this risk to  U.  S.  Steel.   The
    environmental portion of the contingency footnote on pages F-52 through F-
    54   contains  much  greater  detail.   Although  the  number   does   not
    specifically appear on the page, the disclosure on page F-53  discusses  a
    total  of 62 sites consisting of: (i) 4 sites included in the $52  million
    accrual, where we do not expect significant future accrual changes; (ii) 4
    specifically identified major sites where, at the time of filing the  Form
    10-K,  we believed there could be material accrual additions (Gary  Works,
    Fairfield  Works, the Municipal Industrial & Disposal Superfund  Site  and
    Geneva  Works);  (iii) 9 additional sites with accruals over  $1  million,
    consisting  of  $14  million for closure costs for three  hazardous  waste
    sites  at  Gary Works and $20 million for the other 8 sites; and  (iv)  45
    remaining  sites  that have accrued liabilities of less than  $1  million,
    with  36  of  these  sites having liabilities of less than  $500,000.   In
    future filings we will enumerate the sites as set forth above.

  (p)   Overall,  it appears that you are disclosing that you have accrued  $145
million  related  to environmental liabilities.  It is unclear whether  the  $52
million  disclosed on page F-53 is included in that amount.  It is also  unclear
whether you have accrued any other legal/administrative costs related to issues,
other  than  those  associated with the $52 million on page  F-53.   Further  it
appears  that  you  believe  the high end of the reasonably  possible  range  of
additional  loss  related to those four liabilities is $40  million.   In  other
words  the  only  additional estimate range is that established for  those  four
environmental sites described in the beginning of the second paragraph on page
F-53. For all other sites, no estimate of reasonably possible additional  costs
can be made.

    RESPONSE:  Please see our responses to comments (f), (k), (l) and (o).  We
    have  not  provided  any  estimate of the range  of  potential  additional
    liability on any sites other than the aggregate for these four sites  (now
    only for the three sites identified in our Form 10-Q for the first quarter
    of  2006). As indicated in our response to comment (e), we do not  possess
    the   detailed  information  necessary  to  reasonably  estimate  possible
    additional losses on a site-by-site basis.

  (q)   In  this regard, please help us better understand, addressing each  site
individually, why you cannot establish ranges of reasonably possible  losses  in
excess  of amounts accrued for any other site, except those four.  Address  each
individual site noted on pages 31-35 (other than the four sites).

    RESPONSE:   Please see our responses to comments (e) and (r).   As  stated
    above,  we  do not possess the detailed information necessary to  estimate
    possible additional losses for the additional sites noted on pages 31-35.

  (r)   Further address for us whether you believe it is, or is not,  reasonably
possible  that  additional  material loss could occur,  for  all  the  sites  in
aggregate, other than the "material four".

    RESPONSE:  At this time, and based upon our knowledge of the other  sites,
    we do not believe that additional material losses are reasonably possible.
    However, this is an imprecise and ever evolving area.  For example, it  is
    possible  that  additional  information could  become  available  as  site
    investigations continue that could change our assessment of the amount  of
    potential losses.  In addition, as we disclose on page 32 of the Form  10-
    K,  there  are  12  additional sites where we  have  received  information
    requests  or there are other indications that U. S. Steel may  be  a  PRP.
    However,  neither  the  agency  nor  we  have  sufficient  information  to
    determine whether U. S. Steel was actually involved at the site, the level
    of  U.  S.  Steel's activity or the nature of the underlying environmental
    concern.   We believe that the overview of our environmental exposures  on
    pages  19-21 and 31-35 of the Form 10-K and in the Risk Factor on page  24
    provide a reader with a meaningful sense of the additional possible risks.

As  indicated  in  several of the responses above, U. S. Steel will  incorporate
those  comments  of  the Commission that are pertinent to our quarterly  filings
into  our next Form 10-Q and address the remaining comments as we draft our next
Form 10-K and other future filings.

As requested in your letter, U. S. Steel acknowledges that it is responsible for
the  adequacy and accuracy of its filings; that the Commission is not foreclosed
from  taking action as a result of staff comments or changes in disclosure as  a
result of staff comments; and that U. S. Steel may not assert staff comments  as
a  defense  in  any proceeding initiated by the Commission or any  other  person
under the federal securities law.

Please  contact  me, or, in my absence, Jack Moran, Senior Counsel  -  Corporate
(412-433-2890)  with  any  questions.  With respect to  any  accounting  issues,
please  contact  Larry  Schultz, Vice President and  Controller  (412-433-1139),
Hayley Scott-Davis, Director - Financial Analysis & External Reporting (412-433-
5556) or Colleen Darragh, Director - Financial Analysis & External Reporting
(412-433-5606) directly.

                                   Very truly yours,

                                   /s/ Robert M. Stanton

                                   Robert M. Stanton