Boulder Police Department

Boulder Police Department serves Boulder, MT. Notice: 9/9/26 Jefferson County is updating the local floodplain regulations to comply with state and federal requirements. Notice of Recording Fee Increase Jefferson County Capital Improvements Plan Survey Sign up for Emergency Notifications Here County Websites County Holidays 2026 County Offices are closed and services may not be available on Federal Holidays. Martin Luther King Jr Day, January 19 President’s Day, February 16 Memorial Day, May 25 Independence Day, July 3 Labor Day, September 7 Columbus Day, October 12 Election Day, November 3 Veteran’s Day, November 11 Thanksgiving Day , November 26 Christmas Day, December 25 New Year’s Day, January 1, 2027 Jefferson County Montana PO Box H Boulder, MT 59632 © 2026 Employee Email Access Employee Email Access Scroll to Top Dial 911 for emergencies.

According to the U.S. Census Bureau (ACS 2023), Boulder city, MT has an estimated population of 1,326.