Chelmsford, MA Area Codes
Chelmsford is served by area codes 351 and 978. It is in Massachusetts, Middlesex County. About 26,650 people live in its 1 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 351, 978 |
| State / province | Massachusetts |
| County | Middlesex County |
| Population | 26,650 |
| ZIP codes | 1 |
| Time zone | Eastern |
| Coordinates | 42.5908, -71.3552 |
What area code is Chelmsford in?
ZIP codes in the code footprint
Nearby towns and their area codes
North Billerica 508, 978North Chelmsford 351, 978Lowell 351, 978Westford 351, 508, 978Billerica 508, 978Tyngsboro 351, 978Tewksbury 351, 978Dracut 351, 978
How to dial
Dial 351 + 7 digits for a number in Chelmsford, or +1 351 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.