List of state highways in Marquette County, Michigan

The list of highways in Marquette County, Michigan includes all state trunkline highways located in Marquette County, Michigan. These roads account for about 173 mi of the highway system in Michigan. Most roads within the county are two-lane highways, while others are sections of four-lane highways or city streets. There are no interstate highways in Marquette County. There is one U.S. Highway that runs through the county, U.S. Highway 41 and six other currently signed trunklines. There is a state-maintained business loop in the county included in the total. There are two former trunklines, one of which was a business loop.

Highways
The highways in Marquette County fall into one of two general classifications: state trunklines and county roads. The Michigan Department of Transportation (MDOT) maintains two categories of trunklines that run through the county, US highways and regular state trunklines.

U.S. highways
There has been one U.S. highway in Marquette County, U.S. Highway 41, which spans for over 60 mi within the county. The route was numbered by 1919 as M-15, however this designation was changed in 1926. Since its designation, US 41 has served the cities of Marquette, Negaunee, and Ishpeming. US 41 has had two business loops in the county, although neither of them still exist as BUS US 41. US 41/M-28 run concurrently through the county, forming a major artery for Michigan and even Canadian traffic..

State trunklines
There have been at least eight state trunkline highways in Marquette County, three of which have been decommissioned or redesignated. Trunklines that are not Interstate or US highways bear a M-route designation with the diamond marker. M-15 is now US 41 while both BUS US 41 and M-554 have been transferred to the City of Marquette and were reclassified as city streets. Other trunklines in the county include M-35 and the M-route trunkline that bears the highest number in the state, M-553. The longest M-route state trunkline, M-28 which runs for 290.46 mi across the UP crosses Marquette County as well.

County-maintained roads
All public roadways in Michigan that are not state trunklines or city streets are maintained by the county road commission. Marquette County signs primary county roads with a marker bearing a three-digit number. Other roads are assigned double- or triple-letter designations in addition to any names assigned to the roadways.

Statistics
The chart below shows current interstate, U.S., and state highways by year of creation, length, and towns crossed.