<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS OF COSTILLA ENERGY, INC. FOR THE
QUARTER ENDED JUNE 30, 1999, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH 10-Q
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                           3,054
<SECURITIES>                                         0
<RECEIVABLES>                                    9,945
<ALLOWANCES>                                       842
<INVENTORY>                                          0
<CURRENT-ASSETS>                                11,902
<PP&E>                                         180,315
<DEPRECIATION>                                  86,316
<TOTAL-ASSETS>                                 113,610
<CURRENT-LIABILITIES>                           47,687
<BONDS>                                        181,665
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          5
<COMMON>                                         1,410
<OTHER-SE>                                   (117,157)
<TOTAL-LIABILITY-AND-EQUITY>                   113,610
<SALES>                                         25,052
<TOTAL-REVENUES>                                25,319
<CGS>                                           10,718
<TOTAL-COSTS>                                   12,249
<OTHER-EXPENSES>                                74,262
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              10,547
<INCOME-PRETAX>                               (71,739)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (71,739)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (71,739)
<EPS-BASIC>                                     (5.42)
<EPS-DILUTED>                                   (5.42)