Boulder Flag

Boulder

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

Boulder is a city located in Jefferson County, Montana. Boulder has a 2026 population of 1,305. It is also the county seat of Jefferson County. Boulder is currently growing at a rate of 1.32% annually and its population has increased by 8.3% since the most recent census, which recorded a population of 1,205 in 2020.

1.3K
Total Population
1,161
Density (mi²)
17 1.32%
Growth

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)