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/EUREKA

Eureka ZIP code, Montana

The ZIP code for Eureka, MT is 59917, and its area code is 406.

USPS city name
1 ZIP code
Overlapping the city
1 more
Population
1,840
Area code
406
State
Montana

Mail addressed to Eureka uses the ZIP code above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

Eureka in numbers

About 1,840 people live in Eureka, in 610 households. The median household income is $38,750 a year, 47% below the Montana median of $72,509 (US: $80,734). The median owner-occupied home is valued at $172,000 (54% below the Montana median), and median gross rent is $1,038 a month. The median age is 42.4; 6.8% of adults 25 and over hold a bachelor's degree or higher (35.2% across Montana); the average commute takes 14 minutes.

Population1,840Eureka1,840
Households610Eureka610
Median age42.4Eureka42.4Montana40.4US 38.9
Median household income$38,750Eureka$38,750Montana$72,509US $80,734
Median home value$172,000Eureka$172,000Montana$375,800US $332,700
Median gross rent$1,038Eureka$1,038Montana$1,081US $1,413
Bachelor's degree or higher6.8%Eureka6.8%Montana35.2%US 35.7%
Mean commute13.9 minEureka13.9 minMontana19.1 minUS 26.4 min
Population density1,388 / sq miEureka1,388 / sq mi

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

ZIP codes addressed as Eureka

ZIP codes with the USPS city name Eureka
ZIP City Type Population Median income Median home
59917 Eureka , MT Standard 4,920 $50,139 $360,100

Other ZIP codes overlapping Eureka

These ZIP codes cover part of Eureka but are addressed as somewhere else.

ZIP codes overlapping Eureka
ZIP City Type Population Median income Median home
59930 Rexford , MT Standard 1,220 $61,923 $287,400

Map of Eureka ZIP codes

59917

The ZIP codes of Eureka, 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 Eureka

The nearest larger towns are Libby (3,042 people, 41 mi), Whitefish (8,749 people, 44 mi) and Columbia Falls (5,615 people, 53 mi).

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

Cite this page

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

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