Jefferson County Map
The County of Jefferson is located in the State of Montana. Find directions to Jefferson County, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2020 US Census the Jefferson County population is estimated at 12,360 people. The Jefferson County time zone is Mountain Daylight Time which is 7 hours behind Coordinated Universal Time (UTC).
Nearby counties include Broadwater County, Deer Lodge County, Gallatin County, Lewis and Clark County, Madison County, Powell County, Silver Bow County.
Top cities include Boulder, Whitehall, Cardwell, Montana City, Clancy