Area Code Lookup
What Area Code Is Los Alamos?
3 area codes serve Los Alamos
Los Alamos is served by area codes 505, 805, 820. It spans New Mexico and California.
Area Codes Serving Los Alamos
Frequently Asked Questions
What area code is Los Alamos?
Los Alamos is served by area codes 505, 805, 820.
Why does Los Alamos 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). Los Alamos now has 3 area codes — 505 and 805 and 820 — covering the same or overlapping areas.
How do I call Los Alamos from outside the US?
To call Los Alamos from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-505-XXX-XXXX). The +1 is the country code for all NANPA countries.