Postal sector NN1 1
- St. Giles Street, Northampton, NN1 1AF
- Adelaide Place, Northampton, NN1 1AJ
- Northampton, NN1 1AX
- Hazelwood Road, Northampton, NN1 1BF
- Towcester Road, Northampton, NN1 1BQ
- St. Giles Square, Northampton, NN1 1DA
- St. Giles Square, Northampton, NN1 1DE
- George Row, Northampton, NN1 1DF
- St. Johns Street, Northampton, NN1 1DH
- George Row, Northampton, NN1 1DJ
- Guildhall Road, Northampton, NN1 1DN
- Guildhall Road, Northampton, NN1 1DP
- Scholars Court, Northampton, NN1 1DQ
- Spring Gardens, Northampton, NN1 1DR
- Angel Street, Northampton, NN1 1ED
- Towcester Road, Northampton, NN1 1EE
- Bidders Close, Northampton, NN1 1EL
- Gold Street, Northampton, NN1 1EN
- Pen Court, Northampton, NN1 1EP
- St. Johns Street, Northampton, NN1 1EQ
- St. Johns Street, Northampton, NN1 1ER
- Scholars Court, Northampton, NN1 1ES
- St. James Mill Road East, Northampton, NN1 1ET
- Guildhall Road, Northampton, NN1 1EW
- Emerald Way, Northampton, NN1 1EX
- Auctioneers Court, Northampton, NN1 1EY
- The Ridings Arcade, Northampton, NN1 1EZ
- Swan Street, Northampton, NN1 1FA
- St. Peters Street, Northampton, NN1 1FD
- Gaslight Road, Northampton, NN1 1FF
- Victoria Promenade, Northampton, NN1 1HB
- Auctioneers Way, Northampton, NN1 1HF
- Victoria Promenade, Northampton, NN1 1HH
- Victoria Gardens, Northampton, NN1 1HJ
- Cattlemarket Road, Northampton, NN1 1HL
- Derngate, Northampton, NN1 1HS
- Cattle Market Road, Northampton, NN1 1HW
- St. Giles Street, Northampton, NN1 1JA
- St. Giles Street, Northampton, NN1 1JB
- St. Giles Street, Northampton, NN1 1JF
- Castilian Street, Northampton, NN1 1JS
- Castilian Street, Northampton, NN1 1JT
- St. Giles Street, Northampton, NN1 1JW
- Castilian Street, Northampton, NN1 1JX
- Castilian Street, Northampton, NN1 1JY
- Castilian Terrace, Northampton, NN1 1LD
- Hazelwood Road, Northampton, NN1 1LG
- Hazelwood Road, Northampton, NN1 1LJ
- Hazelwood Road, Northampton, NN1 1LN
- Hazelwood Road, Northampton, NN1 1LP
- Hazelwood Road, Northampton, NN1 1LQ
- Hazelwood Road, Northampton, NN1 1LW
- Spring Gardens, Northampton, NN1 1LX
- Bridge Street, Northampton, NN1 1NH
- Bridge Street, Northampton, NN1 1NR
- Bridge Street, Northampton, NN1 1NS
- Bridge Street, Northampton, NN1 1NT
- Bridge Street, Northampton, NN1 1NW
- Bridge Street, Northampton, NN1 1PA
- Bridge Street, Northampton, NN1 1PD
- Bridge Street, Northampton, NN1 1PF
- Commercial Street, Northampton, NN1 1PJ
- Foundry Street, Northampton, NN1 1PN
- Kingswell Street, Northampton, NN1 1PP
- Kingswell Street, Northampton, NN1 1PR
- St. Peters Square, Northampton, NN1 1PS
- St. Peters Walk, Northampton, NN1 1PT
- Woolmonger Street, Northampton, NN1 1PU
- Gas Street, Northampton, NN1 1PY
- Bridge Street, Northampton, NN1 1PZ
- Bridge Street, Northampton, NN1 1QF
- Gold Street, Northampton, NN1 1RA
- Gold Street, Northampton, NN1 1RS
- Gold Street, Northampton, NN1 1RT
- Gold Street, Northampton, NN1 1SA
- St. Peters Street, Northampton, NN1 1SH
- Western View, Northampton, NN1 1SN
- Black Lion Hill, Northampton, NN1 1SP
- Marefair, Northampton, NN1 1SR
- Freeschool Street, Northampton, NN1 1ST
- Black Lion Hill, Northampton, NN1 1SW
- St. Peters Gardens, Northampton, NN1 1SX
- Gregory Street, Northampton, NN1 1TA
- Horseshoe Street, Northampton, NN1 1TB
- St. Peters Way, Northampton, NN1 1TD
- St. Peters Way, Northampton, NN1 1TP
- Derngate, Northampton, NN1 1TY
- Derngate, Northampton, NN1 1UB
- Albion Place, Northampton, NN1 1UD
- Derngate, Northampton, NN1 1UE
- Albion Place, Northampton, NN1 1UG
- Derngate, Northampton, NN1 1UH
- Derngate, Northampton, NN1 1UJ
- Derngate, Northampton, NN1 1US