<ARTICLE>                     5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM COMPANY'S
CONDENSED CONSOLIDATED BALANCE SHEET AND STATEMENT OF INCOME TAXES AND IS 
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.     
</LEGEND>
<CIK>                         0001001185
<NAME>                        IDX SYSTEMS CORPORATION
<MULTIPLIER>                  1,000
<CURRENCY>                    U.S. DOLLARS
       
                                                   
<PERIOD-TYPE>                 6-MOS             6-MOS
<FISCAL-YEAR-END>             DEC-31-1998       DEC-31-1997
<PERIOD-START>                JAN-01-1998       JAN-01-1997
<PERIOD-END>                  JUN-30-1998       JUN-30-1997
<EXCHANGE-RATE>                         1                 1   
<CASH>                             12,537            16,389
<SECURITIES>                      105,470           104,259  
<RECEIVABLES>                      78,230            57,354
<ALLOWANCES>                       (1,356)           (1,197)
<INVENTORY>                             0                 0
<CURRENT-ASSETS>                  205,482           190,805
<PP&E>                             60,393            51,928
<DEPRECIATION>                     30,682            26,014
<TOTAL-ASSETS>                    250,686           224,205
<CURRENT-LIABILITIES>              47,311            47,010
<BONDS>                                 0                 0
<PREFERRED-MANDATORY>                   0                 0
<PREFERRED>                             0                 0
<COMMON>                              263               227
<OTHER-SE>                        194,672           169,812
<TOTAL-LIABILITY-AND-EQUITY>      250,686           224,205
<SALES>                           152,101           116,991
<TOTAL-REVENUES>                  152,101           116,991
<CGS>                              77,656            61,025
<TOTAL-COSTS>                      53,978            44,681
<OTHER-EXPENSES>                        0                 0
<LOSS-PROVISION>                       88               411
<INTEREST-EXPENSE>                     43                64
<INCOME-PRETAX>                    22,848            13,959 
<INCOME-TAX>                       10,340             5,587 
<INCOME-CONTINUING>                12,508             8,372
<DISCONTINUED>                          0                 0
<EXTRAORDINARY>                         0                 0
<CHANGES>                               0                 0 
<NET-INCOME>                       12,508             8,372
<EPS-PRIMARY>                        0.48              0.33
<EPS-DILUTED>                        0.46              0.32