Macomb County, Michigan

Macomb County
Macomb County Administration Building in Mt. Clemens
Location within the U.S. state of Michigan
Michigan's location within the U.S.
Coordinates: 42°40′N 82°55′W / 42.67°N 82.91°W / 42.67; -82.91
Country United States
State Michigan
FoundedJanuary 15, 1818
Named afterAlexander Macomb
SeatMount Clemens
Largest cityWarren
Area
  Total
571 sq mi (1,480 km2)
  Land479 sq mi (1,240 km2)
  Water92 sq mi (240 km2)  16%
Population
 (2020)
  Total
881,217
  Estimate 
(2024)
886,175
  Density1,500/sq mi (600/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional districts9th, 10th
Websitemacombgov.org

Macomb County (/məˈkm/ mə-KOHM) is a county on the eastern shore of the U.S. state of Michigan. It is part of the Detroit metropolitan area, bordering Detroit to the north and containing many of its northern suburbs. Its seat of government is Mt. Clemens, and its largest community is Warren. As of the 2020 census, the county had a population of 881,217, making it the third-most populous county in the state, behind neighboring Wayne and Oakland. Macomb County contains 27 cities, townships and villages, including three of the ten most-populous municipalities in Michigan. Most of this population is concentrated south of Hall Road (M-59), one of the county's main thoroughfares.