<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED FINANCIAL STATEMENTS OF BIRCH TELECOM, INC. AS OF, AND
FOR THE NINE MONTHS ENDING SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH CONDENSED CONSOLIDATED FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                          17,174
<SECURITIES>                                    15,809
<RECEIVABLES>                                   20,997
<ALLOWANCES>                                     3,179
<INVENTORY>                                      3,772
<CURRENT-ASSETS>                                60,993
<PP&E>                                         139,322
<DEPRECIATION>                                  20,684
<TOTAL-ASSETS>                                 222,896
<CURRENT-LIABILITIES>                           40,865
<BONDS>                                        232,116
                          123,550
                                         17
<COMMON>                                             5
<OTHER-SE>                                   (173,657)
<TOTAL-LIABILITY-AND-EQUITY>                   222,896
<SALES>                                         83,869
<TOTAL-REVENUES>                                83,869
<CGS>                                           59,289
<TOTAL-COSTS>                                   59,289
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                 1,952
<INTEREST-EXPENSE>                              15,439
<INCOME-PRETAX>                               (98,704)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (98,704)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (98,704)
<EPS-BASIC>                                    (13.17)<F1>
<EPS-DILUTED>                                  (13.17)<F1>
<FN>
<F1>INCLUDED IN THE CALCULATION IS A 1.795-FOR-1 COMMON STOCK SPLIT EFFECTIVE
APRIL 6, 2000. PRIOR FINANCIAL DATA SCHEDULES HAVE NOT BEEN RESTATED FOR THE
RECAPITALIZATION.
</FN>


</TABLE>



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