Boulder Flag

Boulder

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

Boulder is a city located in Jefferson County, Montana. Boulder has a 2025 population of 1,330 . It is also the county seat of Jefferson County . Boulder is currently growing at a rate of 1.92% annually and its population has increased by 10.37% since the most recent census, which recorded a population of 1,205 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. For every 100 females there are 117.7 males.

1.3K
Total Population
1,183
Density (mi²)
25 1.92%
Growth

Boulder Population

Boulder Population

Data after 2023 is projected based on recent change

Demographics

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

Population by Race

White (92.99%)

Native American (4.22%)

Other race (1.43%)

Two or more races (1.36%)

Race
Population
Percentage (of total)
White1,23392.99%
Native American564.22%
Other race191.43%
Two or more races181.36%

Boulder Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

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

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)