Sitemap to all pages covering the state of Montana. Photo contributions by Alex Nitzman, Andy Field, Billy Fortner, Brent Ivy and Chris Kalina.

Highway Guides

State Highways

Other Roads

Routes in Montana are classified in the following categories:

  • Interstate Routes – 1,192.24 miles
  • Non-Interstate NHS Routes (N Routes) – 2,686.07 miles
  • Primary Routes (P Routes) – 2,813.61 miles
  • Secondary Routes (S Routes) – 4,674.12 miles
  • Urban Routes (U Routes) – 391.82 miles

Mileage statistics of each function class obtained from the 2011 MTD Montana Road Log.

Population Statistics

State Population
1,084,225
Metropolitan Populations
Billings 184,167 Bozeman 118,960
Missoula 117,922 Kalispell 104,357
Great Falls 84,414 Helena 83,058
Top County Populations
Yellowstone 164,731 Gallatin 118,960
Missoula 117,922 Flathead 104,357
Cascade 84,414 Lewis and Clark 70,973
Top City Populations
Billings 109,736 Missoula 76,848
Great Falls 58,353 Bozeman 50,970
Butte 35,180 Helena 33,737
Kalispell 25,329 Belgrade 10,390
Sources: 2020 U.S. Census Data (metro populations and counties), 2020 U.S. Census Estimate (cities)

About Montana

  • Capital: Helena
  • Nickname: Treasure State or Big Sky Country
  • State Flower: Bitterroot
  • State Bird: Western Meadowlark
  • State Animal: Grizzly Bear
  • Total Interstate Mileage: 1,191.23
  • Land Area: 145,545.80 square miles
  • Highest Point: Granite Peak – 12,799 feet
  • Lowest Point: Kootenai River at the Idaho state line, northwest of Troy – 1,820 feet
  • Number of Counties: 56
  • Statehood: 41st state; admitted November 8, 1889

Updated December 29, 2021.