Chelmsford phone numbers start 01245
Chelmsford is in Essex, and its landline numbers begin 01245.
An 01245 number does not prove the caller is in Chelmsford
114 phone companies hold 01245 ranges, a number keeps its code when it moves provider, and caller ID can be faked outright. The code tells you which exchange the range was allocated to - nothing about who dialled.
- Area code
- 01245
- Administrative area
- Essex
- Nation
- England
- Population
- 115,369
- This town
- The place 01245 is named after
- Phone companies holding ranges
- 114
Numbers reported on 01245
Nobody has reported an 01245 number to this site yet. That does not mean an 01245 number is safe - it means no one has told us about one.
Other places on 01245
01245 covers more than Chelmsford. A call showing this code could have been allocated to a range at any of these exchanges.
Codes near Chelmsford
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Buy us a coffeeArea code and range data from Ofcom's published allocations, downloaded 1 October 2026. Town locations, populations and administrative areas from Wikidata (CC0), joined 1 October 2026 - towns within 40 km of the exchange. Reports are from visitors to this site and are unchecked. Browse every town A-Z.