Routes shown in italics are decommissioned within Montana borders.

Montana Interstates have been signed since the late 1950's / early 1960's.

Interstates :

I-15 | I-90 | I-94 | I-115 | I-315

Montana US Highways have been signed since the late 1920's.

US Highways :

US 2 | US 10 | US 10A | US 10N | US 10S | US 12 | US 20 | US 87 | US 87E | US 87W | US 89 | US 93 | US 191 | US 212 | US 287 | US 310 | US 312

Montana state routes were assigned unposted route numbers in the 1920's, but those were not the route numbers first posted in the field @ 1933.

State Routes :

Routes 1 - 50 | Routes 51 - 100 | Routes 101 - up

Secondary State routes were first posted in the late 1960's / early 1970's.

Secondary State Routes :

Routes up to 300 | Routes 301 to 400 | Routes 401 to 500 | Routes 501 and up

Return to Montana Highways Page

Font used on US 312 shield designed by Bruce Cridlebaugh based on original font used on US Highways in the 1920's.
Old Montana State Highway Shield from James Lin's site