<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED STATEMENT OF INCOME FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2000 AND
THE CONDENSED BALANCE SHEET AS OF SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000926282
<NAME> ADTRAN, INC.
<MULTIPLIER> 1

                                        
<PERIOD-TYPE>                                3-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JUL-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                       6,531,156
<SECURITIES>                               152,885,674
<RECEIVABLES>                               81,055,089
<ALLOWANCES>                                   877,409
<INVENTORY>                                 85,331,330
<CURRENT-ASSETS>                           345,350,191
<PP&E>                                     171,753,321
<DEPRECIATION>                              49,612,672
<TOTAL-ASSETS>                             638,008,266
<CURRENT-LIABILITIES>                       67,134,324
<BONDS>                                     50,000,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       394,467
<OTHER-SE>                                 471,491,561
<TOTAL-LIABILITY-AND-EQUITY>               638,008,266
<SALES>                                    127,276,696
<TOTAL-REVENUES>                           127,276,696
<CGS>                                       62,323,706
<TOTAL-COSTS>                               61,323,706
<OTHER-EXPENSES>                            30,219,258
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             589,000
<INCOME-PRETAX>                            116,467,188
<INCOME-TAX>                                39,598,846
<INCOME-CONTINUING>                         76,868,342
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                76,868,342
<EPS-BASIC>                                       1.99
<EPS-DILUTED>                                     1.93