Area Code Lookup
What Area Code Is Longmont?
2 area codes serve Longmont · Colorado
Longmont is served by area codes 720, 983. It is located in Colorado.
Area Codes Serving Longmont
Frequently Asked Questions
What area code is Longmont?
Longmont is served by area codes 720, 983. It is located in Colorado.
Why does Longmont 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). Longmont now has 2 area codes — 720 and 983 — covering the same or overlapping areas.
How do I call Longmont from outside the US?
To call Longmont from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-720-XXX-XXXX). The +1 is the country code for all NANPA countries.