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 — CITY/MT/BOULDER

Boulder ZIP code, Montana

The ZIP code for Boulder, MT is 59632, and its area code is 406.

USPS city name
1 ZIP code
Population
1,284
Area code
406
State
Montana

Boulder in numbers

About 1,284 people live in Boulder, in 520 households. The median household income is $72,500 a year, about the same as the Montana median of $72,509 (US: $80,734). The median owner-occupied home is valued at $212,300 (44% below the Montana median), and median gross rent is $928 a month. The median age is 41.4; 22.1% of adults 25 and over hold a bachelor's degree or higher (35.2% across Montana); the average commute takes 25 minutes.

Population1,284Boulder1,284
Households520Boulder520
Median age41.4Boulder41.4Montana40.4US 38.9
Median household income$72,500Boulder$72,500Montana$72,509US $80,734
Median home value$212,300Boulder$212,300Montana$375,800US $332,700
Median gross rent$928Boulder$928Montana$1,081US $1,413
Bachelor's degree or higher22.1%Boulder22.1%Montana35.2%US 35.7%
Mean commute24.9 minBoulder24.9 minMontana19.1 minUS 26.4 min
Population density1,142 / sq miBoulder1,142 / sq mi

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

ZIP codes addressed as Boulder

ZIP codes with the USPS city name Boulder
ZIP City Type Population Median income Median home
59632 Boulder , MT Standard 2,557 $68,750 $278,800

Map of Boulder ZIP codes

59632

The ZIP codes of Boulder, MT, 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.

Towns near Boulder

The nearest larger towns are Clancy (1,874 people, 16 mi), Montana City (3,092 people, 22 mi) and Helena West Side (1,417 people, 25 mi).

Towns near Boulder
TownPopulationDistance
Montana City 3,092 21.8 mi
Helena 33,639 25.4 mi
Helena Valley Southeast 9,108 28.7 mi
Helena Valley West Central 8,056 29.5 mi

More nearby: every ZIP code in Jefferson County · Montana ZIP codes

Cite this page

zipcodes.pro. “Boulder, MT ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/mt/boulder

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