Bay County, Michigan

Bay County
Location within the U.S. state of Michigan
Michigan's location within the U.S.
Coordinates: 43°43′N 83°56′W / 43.72°N 83.94°W / 43.72; -83.94
Country United States
State Michigan
FoundedFebruary 17, 1857
Named afterSaginaw Bay
SeatBay City
Largest cityBay City
Area
  Total
631 sq mi (1,630 km2)
  Land442 sq mi (1,140 km2)
  Water188 sq mi (490 km2)  30%
Population
 (2020)
  Total
103,856
  Estimate 
(2023)
102,500
  Density160/sq mi (64/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district8th
Websitewww.baycounty-mi.gov

Bay County is located in the U.S. state of Michigan. As of the 2020 Census, the population was 103,856. The county seat is Bay City. Bay County comprises the Bay City, MI Metropolitan Statistical Area and is included in the Saginaw-Midland-Bay City Combined Statistical Area in the Mid/Central Michigan region.