Travel Reference (MT)

Important Notes

Free Highway maps of Montana are available Online. Electronic Version here and Paper Map Request form here

Interstate Highways

I 15

Begins at the US-Candian Border as a continuance of CA 4 in Alberta. Ports of Entry are Coutts on the Canada side and Sweetgrass on the US Side. Travels SB and exits the south side of Montana in to Clark County, Idaho

• Toole County
• Pondera County
• Teton County
• Cascade County
• Lewis and Clark County
• Jefferson County
• Deer Lodge County
• Silver Bow County
• Beaverhead County

I 115

• Service Spur starting in Downtown Butte, and ending also in Butte where it intersects with I 15 and I 90.

I 315

• Service Spur starting in Downtown Great Falls, and ending also in Great Falls where it intersects I 15, US 89 and MT 200

I 90

• Travels predominately East to West, entering Montana from Mullan, Idaho in Shoshone County, ID and leaving the Eastern side of Montana near Ranchester, Wyoming in Sheridan County, WY
• Mineral County
• Missoula County
• Granite County
• Powell County
• Deer Lodge County
• Silver Bow County
• Jefferson County
• Gallatin County
• Park County
• Sweet Grass County
• Stillwater County
• Yellowstone County
• Big Horn County

I 94

• Travels predominately ENE, beginning in Billings after it diverges from I-90 and leaving the Eastern side of Montana near Beach, North Dakota
• Yellowstone County
• Treasure County
• Rosebud County
• Custer County
• Prairie County

Important Highways

US 12

Enters North Dakota near Williston, ND in Williams County West to East

• Lincoln County
• Flathead County
• Glacier County
• Toole County
• Liberty County
• Hill County
• Blaine County
• Phillips County
• Valley County
• Roosevelt County

US 20

Briefly travels through the southern portion of Gallatin County, entering Montana from Freemont County, Idaho at Terghee Pass and leaves Montana in Yellowstone National Park in Park County, Wyoming.

US 87

Begins in Havre, MT and travels SB, leaving the South Side of Montana Sheridan County, Wyoming

• Hill County
• Chouteau County
• Cascade County
• Judith Basin County
• Fergus County
• Petroleum County
• Musselshell County
• Yellowstone County
• Big Horn County

US 89

North to South

• Glacier County
• Pondera County
• Teton County
• Cascade County
• Meagher County (MT
• Park County (MT

US 93

Enters Montana from British Columbia at the Port of Roosville and leaves Montana for Idaho into Lemhi County
North to South

• Lincoln County
• Flathead County
• Lake County
• Missoula County
• Ravalli County

US 191

Enters Montana from Saskatchewan at the Ports of Monchy (Canada Side) and Morgan (US Side) Travels Southbound

• Phillips County
• Fergus County
• Wheatland County
• Sweet Grass County
  

Meets I 90 in Big Timber and travels Westbound with I 90 to Bozeman where it Heads South

• Park County
• Gallatin County
  

Leaves Montana Just East of West Yellowstone, MT as it enters Yellowstone National Park in Wyoming

US 212

West to East

• Park County

• Carbon County
• Yellowstone County
• Bighorn County
• Rosebud County
• Powder River County
• Carter County

US 287

Begins in Choteau, MT and travels SB leaving Montana at Yellowstone National Park in Park County, Wyoming

• Teton County
• Lewis and Clark County
• Broadwater County
• Jefferson County
• Madison County
• Gallatin County

US 310

Spur of US 10 that begins in Greybull, Wyoming travels NB and terminates when it intersects with I-90 Business in Laurel, MT

• Yellowstone County
• Carbon County

Primary Population Centers

Missoula

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