| ZIP Codes: | 3 ZIP Codes (2 Standard, 0 PO Box, 1 Unique) [See All] |
| Area Code: | 505 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:13:12 PM |
| Population: | 19,435 [See All] |
| FIPS: | 35028 |
| CBSA: | Los Alamos, NM |
| Land Area: | 272 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 35.8470, -106.2733 |
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19,435 residents live across 3 ZIPs covering 272 sq mi, served by 2 distinct USPS-recognized cities.
Population moved from 17,974 to 13,598 from 2014 to 2024 — a -24.3% change. 0 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 87547 (White Rock, $156,444 median) and poorest ZIP 87544 (Los Alamos, $138,583) are 8.6 miles apart — a 1.1× income gap across local geography.
Median home values vary 1.0× across this county — from $488,300 in 87544 (Los Alamos) to $505,900 in 87547 (White Rock).
Density varies 2× across the county — from 59 people/sq mi in 87544 (Los Alamos) to 134 in 87547 (White Rock).
Educational attainment ranges from 69.3% bachelor's+ in 87544 (Los Alamos) to 71.0% in 87547 (White Rock) — the breadth of educational profiles across the area.
Within New Mexico, this is the #21 most populous of 34 counties and ranks #1 for median household income with the #7 fastest decade growth .
On the national stage, Los Alamos County is ranks #24 for income .
Hosts 1 single-entity Unique ZIP: 87545Scientific Lab .
Weighted by population, the typical household earns about $143,947 across the county — reflecting what a typical resident sees, not a simple ZIP average.
69.7% of adults age 25+ hold a bachelor's degree or higher (9,792 of 14,040 reporting).
2 Standard delivery, 0 PO Box only, 1 single-entity Unique ZIPs serve this county.
2 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.