LOCAL PHONE-NUMBER INFORMATIONCostessey
Costessey
The 01603 code.
South Norfolk. This town is associated with this code in the existing reference dataset. An area code does not locate a caller.
Start with the call.
Read reports on the full number. Local-looking digits alone never establish identity.
The allocation context.
- Code
- 01603
- Allocation holders
- 90
- Allocated blocks
- 367
Figures cover the whole code, not just Costessey. Allocated blocks are not counts of active callers.
Understand 01603 →Nearby towns
Nearby places are measured by straight-line distance. Proximity does not prove that a code serves a particular address.
Wymondham01953 · about 12 km awayAylsham01263 · about 15 km awayBrooke01508 · about 17 km awayHingham01953 · about 18 km awayDereham01362 · about 19 km awayLong Stratton01508 · about 19 km away
Place reference: existing GotMyNumber Wikidata dataset. Allocation snapshot downloaded 23 September 2026. Place source ↗