Jefferson County lies in southwestern Montana, between Butte and Helena. Its seat is Boulder, and it includes growing commuter communities such as Clancy and Jefferson City. The county’s location along I-15 makes it popular for residents who work in Helena or Butte but prefer rural living. The area mixes small-town, ranch and forested land, with recreational access to mountains and rivers. Home prices vary by proximity to Helena: existing homes near Clancy/Jefferson City often range $400K-$600K+, while homes further south or rural areas can be $250K-$400K. Building new homes (land + build) costs about $400K-$650K+, depending on site and finish. The county is semi-rural/suburban, with fast access to urban jobs but rural scenery.