Hillsdale County, Michigan

Hillsdale County, Michigan
Location within the U.S. state of Michigan
Coordinates: 41°53′N 84°35′W / 41.89°N 84.59°W / 41.89; -84.59
Country United States
State Michigan
Founded1835
SeatHillsdale
Largest cityHillsdale
Area
 • Total
607 sq mi (1,570 km2)
 • Land598 sq mi (1,550 km2)
 • Water8.9 sq mi (23 km2)  1.5%
Population
 (2020)
 • Total
45,746
 • Estimate 
(2024)
45,590
 • Density76/sq mi (29/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district5th
Websitehttps://www.co.hillsdale.mi.us/

Hillsdale County is a county located in the U.S. state of Michigan. As of the 2020 Census, the population was 45,746. The county seat is Hillsdale. Hillsdale County is the only county in Michigan to border both Indiana and Ohio. Due to an angle in the state's border with Ohio, Hillsdale County has the southernmost point in Michigan. Hillsdale County is conterminous with the Hillsdale, MI Micropolitan Statistical Area. The county is the home of Hillsdale College, a private liberal-arts college. The Hillsdale County Courthouse was designed by Claire Allen, a prominent southern Michigan architect.