Montana · Census place 3008575

Boulder, Montana

Boulder is a city in Jefferson County, Montana with an estimated 1,305 residents on July 1, 2024. It is the 49th largest of 55 incorporated places of 1,000+ people in the state.

Population 2024: 1,305; #49 of 55 in Montana
Change since 2020: +8.3%; +100 people
Land area: 1.1 sq mi
Density: 1,165 / sq mi; State median 2,232

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

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Tools and pages that start from Boulder

Boulder population, 2020 to 2024

Boulder added 100 residents from July 2020 to July 2024, a change of +8.3%. In the latest year it moved by +17.

July 1 estimates. The April 2020 estimates base was 1,200. The axis starts above zero so yearly changes are visible.

Boulder covers 1.12 square miles of land, for 1,165 people per square mile of land. The median Montana place of 5,000+ has 2,232, so Boulder is less dense than the typical town.

What county Boulder is in

All of Boulder's residents live in Jefferson County, which had 13,304 residents in 2024. Boulder holds 9.8% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Boulder

1 ZIP Code Tabulation Area (ZCTA) overlaps Boulder by at least 10% of the ZCTA's or the city's land: 59632. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Boulder is

The Census internal point of Boulder is at 46.235800, -112.119700. Helena, the capital, is 24.7 miles NNE in a straight line. The nearest larger place is Helena, MT (34,729 people), 25.4 miles away. The nearest city of 100,000 or more is Billings, MT, 173.9 miles away.

Internal point

Decimal: 46.235800, -112.119700
DMS: 46°14'8.88"N 112°07'10.92"W
UTM: 12N 413668.3E 5120856.3N
Geohash: c80r08uzj
Plus code: 85R96VPJ+84

Daylight in Boulder

At 46.24° N, Boulder gets about 15 h 47 min of daylight around the June solstice and 8 h 37 min around the December solstice, a swing of 7 h 11 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Boulder

The eight nearest incorporated places of 1,000+ in Montana, measured between internal points. The closest is Whitehall, 25.2 miles away, with 1,116 people.

Questions people ask

What is the population of Boulder, MT?

1,305 on July 1, 2024, in the Census Vintage 2024 estimates. That is up 100 (8.3%) from 1,205 in July 2020.

What county is Boulder in?

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

What ZIP codes cover Boulder?

1 ZIP Code Tabulation Area overlaps it by at least 10% of either area: 59632.

How far is Boulder from Helena?

24.7 miles (39.7 km) in a straight line, heading NNE from Boulder.

What is the nearest larger city to Boulder?

Helena, MT, with 34,729 residents, 25.4 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.