Boulder city, Montana
Official LSAD Designation: Boulder city • Census GEOID: 3008575
• Jefferson County
Demographics & Population Profile
Population and demographics for Boulder city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 1,305 | — | 2025 | Census |
| Median Age | 41.4 yrs | ±7.7 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 520 | ±113 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).