<ARTICLE> 5
<LEGEND>
     THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRADTED FROM THE
CONDENSED STATEMENT OF INCOME FOR THE THREE MONTHS ENDED JUNE 30, 1999 AND THE
CONDENSED BALANCE SHEET AS OF JUNE 30, 19999 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000926282
<NAME> ADTRAN, INC.

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             APR-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                      37,599,951
<SECURITIES>                                24,132,108
<RECEIVABLES>                               62,085,964
<ALLOWANCES>                                   838,050
<INVENTORY>                                 55,448,469
<CURRENT-ASSETS>                           183,839,150
<PP&E>                                     128,317,577
<DEPRECIATION>                              35,124,070
<TOTAL-ASSETS>                             332,987,602
<CURRENT-LIABILITIES>                       28,734,335
<BONDS>                                     50,000,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       394,409
<OTHER-SE>                                 250,563,718
<TOTAL-LIABILITY-AND-EQUITY>               332,987,602
<SALES>                                     88,506,872
<TOTAL-REVENUES>                            88,506,872
<CGS>                                       45,151,016
<TOTAL-COSTS>                               45,151,106
<OTHER-EXPENSES>                            27,825,566
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             576,333
<INCOME-PRETAX>                             16,114,635
<INCOME-TAX>                                 5,398,403
<INCOME-CONTINUING>                         10,716,232
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                10,716,232
<EPS-BASIC>                                        .28
<EPS-DILUTED>                                      .28