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County ZIP codes · New Mexico · FIPS 35028

Los Alamos County, NM ZIP Codes

Los Alamos County, New Mexico has 3 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 2 residential and 1 for PO boxes or a single organization. 1 of the residential ones lie mainly in Los Alamos County and 1 mainly in a neighboring county; 1 cross the county line. Median household income ranges from $138,583 in 87544 (Los Alamos) to $156,444 in 87547 (White Rock) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Los Alamos County?

87544 · Los Alamos: $139k87547 · White Rock: $156k875448754787544 · Los Alamos: $139k87547 · White Rock: $156k875448754787544 · Los Alamos: $139k87547 · White Rock: $156k8754487547
The residential ZIP codes of Los Alamos County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

They carry 2 postal town names: Los Alamos, White Rock.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 2 residential ZIP codes in Los Alamos County

1 ZIP code lies mainly in Los Alamos County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Los Alamos County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
87547 White Rock 5,837 899 $156k $506k 100%

Partly in Los Alamos County

Residential ZIP codes mainly in another county that reach at least 1% into Los Alamos County, by their share here
In this county
87544 Los Alamos 13,598 102 $139k $488k 42%

Download the 3 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

1 ZIP code of Los Alamos County extends into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Los Alamos County and in the neighboring counties
ZIPIn Los AlamosElsewhere
8754442%Sandoval County 58%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Los Alamos County without a residential area (GeoNames postal codes)
ZIPPostal name
87545Los Alamos

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Los Alamos County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Los Alamos County starts with 875.

Three-digit prefixes of Los Alamos County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Los Alamos County's
PrefixSectional centerHereAll codes
875 Albuquerque, NM (SCF 870) 3 71

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.