Boulder

County:: Jefferson County
County Seat:: Yes
Area (mi²):: 1.124
State:: Montana

Boulder is a city located in Jefferson County, Montana. Boulder has a 2025 population of 1,334. It is also the county seat of Jefferson County. Boulder is currently growing at a rate of 1.99% annually and its population has increased by 10.61% since the most recent census, which recorded a population of 1,206 in 2020.

The average household income in Boulder is $79,712 with a poverty rate of 8.72%. The median age in Boulder is 40.8 years: 41.1 years for males, and 37.9 years for females.

Demographics

The racial composition of Boulder includes 92.99% White, 4.22% Native American, and smaller percentages for other race, Two or more races, Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Native American

Other race

Two or more races

Black or African American

Asian

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	1,233	92.99%
Native American	56	4.22%
Other race	19	1.43%
Two or more races	18	1.36%
Black or African American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%

Boulder Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Boulder's average per capita income is $37,955. Household income levels show a median of $61,250. The poverty rate stands at 8.72%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$100,781	-
Families	$64,375	$99,866
Households	$61,250	$79,712
Non Families	$40,789	$44,321

$37,955

Average Income

$61,250

Median Household Income

8.72%

Poverty Rate