Marquette County, Michigan

Marquette County
Marquette County Courthouse in Marquette
Location within the U.S. state of Michigan
Michigan's location within the U.S.
Coordinates: 46°40′N 87°36′W / 46.66°N 87.6°W / 46.66; -87.6
Country United States
State Michigan
FoundedMarch 9, 1843, organized 1851
Named afterJacques Marquette
SeatMarquette
Largest cityMarquette
Area
  Total
3,425 sq mi (8,870 km2)
  Land1,808 sq mi (4,680 km2)
  Water1,616 sq mi (4,190 km2)  47%
Population
 (2020)
  Total
66,017
  Estimate 
(2023)
66,999
  Density37/sq mi (14/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district1st
Websitewww.co.marquette.mi.us

Marquette County (/mɑːrˈkɛt/ mar-KET) is a county located in the Upper Peninsula of the U.S. state of Michigan. As of the 2020 census, the population was 66,017. It is the most populous county in the Upper Peninsula. The county seat is Marquette. The county is named for Father Marquette, a Jesuit missionary. It was set off in 1843 and organized in 1851.

Marquette County comprises the Marquette, MI micropolitan statistical area.