Montana · Census place 3024850

Eureka, Montana

Eureka is a town in Lincoln County, Montana with an estimated 1,561 residents on July 1, 2024. It is the 46th largest of 55 incorporated places of 1,000+ people in the state.

Population 2024: 1,561; #46 of 55 in Montana
Change since 2020: +12.3%; +171 people
Land area: 1.3 sq mi
Density: 1,174 / sq mi; State median 2,232

Orange pin: Eureka. Shaded: its county. Dark pin: Helena.

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Tools and pages that start from Eureka

Eureka population, 2020 to 2024

Eureka added 171 residents from July 2020 to July 2024, a change of +12.3%. In the latest year it moved by +24.

July 1 estimates. The April 2020 estimates base was 1,386. The axis starts above zero so yearly changes are visible.

Eureka covers 1.33 square miles of land, for 1,174 people per square mile of land. The median Montana place of 5,000+ has 2,232, so Eureka is less dense than the typical town.

What county Eureka is in

All of Eureka's residents live in Lincoln County, which had 22,184 residents in 2024. Eureka holds 7.0% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Eureka

1 ZIP Code Tabulation Area (ZCTA) overlaps Eureka by at least 10% of the ZCTA's or the town's land: 59917. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a town that annexed land after 2020 may reach into ZIP codes not listed here.

Where Eureka is

The Census internal point of Eureka is at 48.878900, -115.049200. Helena, the capital, is 212.0 miles SE in a straight line. The nearest larger place is Libby, MT (3,235 people), 41.2 miles away. The nearest city of 100,000 or more is Spokane Valley, WA, 130.9 miles away.

Internal point

Decimal: 48.878900, -115.049200
DMS: 48°52'44.04"N 115°02'57.12"W
UTM: 11N 643028.3E 5415828.4N
Geohash: c2wnjfpsp
Plus code: 85W6VXH2+H8

Daylight in Eureka

At 48.88° N, Eureka gets about 16 h 11 min of daylight around the June solstice and 8 h 15 min around the December solstice, a swing of 7 h 57 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Eureka

The eight nearest incorporated places of 1,000+ in Montana, measured between internal points. The closest is Libby, 41.2 miles away, with 3,235 people.

Questions people ask

What is the population of Eureka, MT?

1,561 on July 1, 2024, in the Census Vintage 2024 estimates. That is up 171 (12.3%) from 1,390 in July 2020.

What county is Eureka in?

Lincoln County. All of its residents live in that county.

What ZIP codes cover Eureka?

1 ZIP Code Tabulation Area overlaps it by at least 10% of either area: 59917.

How far is Eureka from Helena?

212.0 miles (341.2 km) in a straight line, heading SE from Eureka.

What is the nearest larger city to Eureka?

Libby, MT, with 3,235 residents, 41.2 miles away between internal points.

Sources and data as of

Data as of: Census Vintage 2024 subcounty estimates (July 1, 2024), 2024 Gazetteer places, 2020 ZCTA to place relationship file.

How every number is computed: methodology. Spotted a wrong figure? Report an error.