Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/NM/COUNTY/LOS-ALAMOS

Los Alamos County, NM ZIP codes

Los Alamos County, NM has 2 ZIP codes, in 2 towns: 87545 and 87547. 1 more crosses into it from a neighbouring county: 87544.

The county seat is Los Alamos.

ZIP codes
2
Partly in it
1 more
Towns
2
County seat
Los Alamos
County FIPS
35028
Population
19,435
Median household income
$147,139
Land area
109 sq mi
Metro area
Los Alamos

Los Alamos County ZIP codes by town

Los Alamos (county seat)
87545

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

ZIP codes partly in Los Alamos County

This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Los Alamos County.

Map of Los Alamos County ZIP codes

8754587547

The ZIP codes of Los Alamos County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Los Alamos County in numbers

About 19,435 people live in Los Alamos County, in 8,247 households, the 20th most populous of New Mexico's 33 counties. The median household income is $147,139 a year, 2.3 times the New Mexico median of $64,059 (US: $80,734). The median owner-occupied home is valued at $495,800 (2.0 times the New Mexico median), and median gross rent is $1,375 a month. The median age is 39.3; 69.7% of adults 25 and over hold a bachelor's degree or higher (31.0% across New Mexico); the average commute takes 15 minutes.

Population19,435Los Alamos19,435
Households8,247Los Alamos8,247
Median age39.3Los Alamos39.3New Mexico39.4US 38.9
Median household income$147,139Los Alamos$147,139New Mexico$64,059US $80,734
Median home value$495,800Los Alamos$495,800New Mexico$248,100US $332,700
Median gross rent$1,375Los Alamos$1,375New Mexico$1,067US $1,413
Bachelor's degree or higher69.7%Los Alamos69.7%New Mexico31.0%US 35.7%
Mean commute14.7 minLos Alamos14.7 minNew Mexico23.5 minUS 26.4 min
Population density178 / sq miLos Alamos178 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Los Alamos County

Largest towns in Los Alamos County
TownZIP codesPopulation
Los Alamos 1 13,317
White Rock 1 5,716

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Los Alamos County.

Not sure you are in Los Alamos County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Los Alamos County, with figures

ZIP codes in Los Alamos County
ZIP City Type Population Median income Median home
87545 Los Alamos , NM No street area — — —
87547 White Rock , NM Standard 5,837 $156,444 $505,900

Cite this page

zipcodes.pro. “Los Alamos County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/nm/county/los-alamos

Underlying data is public domain or openly licensed — sources, vintages and licences.