<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
condensed statement of income for the three months ended March 31, 2000 and the
condensed balance sheet as of March 31, 2000 and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<CIK> 0000926282
<NAME> ADTRAN, INC.
<MULTIPLIER> 1
<CURRENCY> U.S.DOLLAR

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-31-2000
<PERIOD-END>                               MAR-31-2000
<EXCHANGE-RATE>                                      1
<CASH>                                      25,749,433
<SECURITIES>                                68,756,490
<RECEIVABLES>                               62,971,979
<ALLOWANCES>                                   986,771
<INVENTORY>                                 59,692,478
<CURRENT-ASSETS>                           229,056,997
<PP&E>                                     154,262,624
<DEPRECIATION>                              43,370,061
<TOTAL-ASSETS>                             583,828,137
<CURRENT-LIABILITIES>                       31,500,649
<BONDS>                                     50,000,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       394,466
<OTHER-SE>                                 421,667,867
<TOTAL-LIABILITY-AND-EQUITY>               583,828,137
<SALES>                                     99,470,351
<TOTAL-REVENUES>                            99,470,351
<CGS>                                       45,065,863
<TOTAL-COSTS>                               45,065,863
<OTHER-EXPENSES>                            29,934,667
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             576,333
<INCOME-PRETAX>                             25,446,540
<INCOME-TAX>                                 8,652,065
<INCOME-CONTINUING>                         16,794,475
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                16,795,190
<EPS-BASIC>                                        .44
<EPS-DILUTED>                                      .42