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NN1 1DU
a defunct large user postcode in Northampton, West Northamptonshire
This postcode was deleted in December 1992.
The nearest currently active postcodes are:
Guildhall Road NN1 1EW
Guildhall Road NN1 1AG
Guildhall Road NN1 1DT
St. Johns Street NN1 1EQ
Guildhall Road NN1 1EA
Guildhall Road NN1 1DD
St. Giles Square NN1 9SJ
Guildhall Road NN1 1DN
NN1 1FA
St. Johns Street NN1 1ER