Telephone numbers beginning with 01604 belong to the Northampton charge group.
The following numbers are local calls
to and from this charge group:
01234
01327
01536
01788
01858
01908
01933
The following numbers are regional calls
to and from this charge group:
0116
01203
01280
01295
01296
01442
01455
01462
01480
01525
01572
01582
01608
01675
01676
01767
01780
01789
01832
01844
01869
01926
All other calls are national calls.
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