Area Code Lookup
What Area Code Is Waltham?
2 area codes serve Waltham · Massachusetts
Waltham is served by area codes 339, 781. It is located in Massachusetts.
Area Codes Serving Waltham
Frequently Asked Questions
What area code is Waltham?
Waltham is served by area codes 339, 781. It is located in Massachusetts.
Why does Waltham have multiple area codes?
As demand for phone numbers increased, NANPA added area codes through splits (dividing the region) or overlays (layering a new code over the same geography). Waltham now has 2 area codes — 339 and 781 — covering the same or overlapping areas.
How do I call Waltham from outside the US?
To call Waltham from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-339-XXX-XXXX). The +1 is the country code for all NANPA countries.