ZIP codes in Los Alamos County
3 ZIPs touch Los Alamos County, New Mexico. The blue dashed line is the county border; orange ZIPs reach into it.
3
ZIP codes
1
cross the county line
19,435
people in these ZIPs
33
counties in NM
Most people
Los Alamos County ZIP list
More counties in New Mexico
- Grant County19
- Guadalupe County7
- Harding County7
- Hidalgo County5
- Lea County13
- Lincoln County19
- Luna County4
- McKinley County24
- Mora County14
- Otero County17
- Quay County12
- Rio Arriba County37
Questions people actually ask
How many ZIP codes are in Los Alamos County, New Mexico?
3 ZIP codes reach into Los Alamos County, including 1 PO Box or single-address ZIPs placed by the town they serve. 1 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Los Alamos County has the most people?
87544 (Los Alamos) has about 13,598 residents, the most of any ZIP touching Los Alamos County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Los Alamos County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Los Alamos County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from