Monroe County, Michigan

Monroe County
Monroe County Courthouse
Location within the U.S. state of Michigan
Michigan's location within the U.S.
Coordinates: 41°55′N 83°30′W / 41.92°N 83.5°W / 41.92; -83.5
Country United States
State Michigan
FoundedJuly 14, 1817
Named afterJames Monroe
SeatMonroe
Largest cityMonroe
Area
  Total
680 sq mi (1,800 km2)
  Land549 sq mi (1,420 km2)
  Water131 sq mi (340 km2)  19%
Population
 (2020)
  Total
154,809
  Estimate 
(2023)
155,045
  Density230/sq mi (88/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional districts5th, 6th
Websitewww.co.monroe.mi.us

Monroe County is a county in the U.S. state of Michigan. As of the 2020 Census, the population was 154,809. The largest city and county seat is Monroe. The county was established as the second county (after Wayne County) in the Michigan Territory in 1817 and was named for then-President James Monroe. Monroe County is coterminous with the Monroe metropolitan statistical area.