Area Code Lookup
What Area Code Is Waterloo?
5 area codes serve Waterloo
Waterloo is served by area codes 315, 319, 443, 450, 579. It spans New York and Iowa and Maryland and Quebec.
Area Codes Serving Waterloo
Frequently Asked Questions
What area code is Waterloo?
Waterloo is served by area codes 315, 319, 443, 450, 579.
Why does Waterloo 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). Waterloo now has 5 area codes — 315 and 319 and 443 and 450 and 579 — covering the same or overlapping areas.
How do I call Waterloo from outside the US?
To call Waterloo from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-315-XXX-XXXX). The +1 is the country code for all NANPA countries.