Area Code Lookup
What Area Code Is Watertown?
4 area codes serve Watertown
Watertown is served by area codes 605, 617, 857, 920. It spans South Dakota and Massachusetts and Wisconsin.
Area Codes Serving Watertown
Frequently Asked Questions
What area code is Watertown?
Watertown is served by area codes 605, 617, 857, 920.
Why does Watertown 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). Watertown now has 4 area codes — 605 and 617 and 857 and 920 — covering the same or overlapping areas.
How do I call Watertown from outside the US?
To call Watertown from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-605-XXX-XXXX). The +1 is the country code for all NANPA countries.