Montana Highway 66 (MT 66) is a 50-mile-long (80 km)^[2] state highway in the US state of Montana. It begins at an intersection with U.S. Highway 191 (US 191) in far southwestern Phillips County and runs northerly to the town of Fort Belknap in Blaine County. Approximately 40 miles (64 km) of the northern end of the route is within the boundaries of the Fort Belknap Indian Reservation,^[1]: 193 running through the bulk of its territory.

Quick Facts Route information, Length ...

Montana Highway 66
MT 66 highlighted in red
Route information
Maintained by MDT
Length	50.022 mi[1]: 105  (80.503 km)
Major junctions
South end	US 191 south of Landusky
North end	US 2 at Fort Belknap
Location
Country	United States
State	Montana
Counties	Phillips, Blaine
Highway system
Montana Highway System Interstate US State Secondary
← MT 64 → MT 67

Close

MT 66 starts at an intersection with US 191 approximately 55 miles (89 km) southwest of Malta.^{[1]: 88–89} It proceeds in a generally northwesterly direction, skirting the western edge of the Little Rocky Mountains. The road turns north just before crossing the county line from Phillips County into Blaine County, and subsequently enters the Fort Belknap Indian Reservation where it remains for the rest of its journey. After passing the small community of Hays on its western edge, the road continues north on a mostly straight route before turning northwest and enters Fort Belknap from the south, before a final turn to the northeast joins MT 66 to US 2 at a rest area.^[2]

Before receiving its current designation in 1978, MT 66 was designated as Montana Secondary Highway 376 (S-376).^[3][4]