St. Joseph County, Indiana

Saint Joseph County
Old St. Joseph County courthouse in South Bend, Indiana
Location within the U.S. state of Indiana
Indiana's location within the U.S.
Coordinates: 41°37′N 86°17′W / 41.62°N 86.29°W / 41.62; -86.29
Country United States
State Indiana
Founded1830
Named afterSt. Joseph River
SeatSouth Bend
Largest citySouth Bend
Area
  Total
461.38 sq mi (1,195.0 km2)
  Land457.85 sq mi (1,185.8 km2)
  Water3.54 sq mi (9.2 km2)  0.77%
Population
 (2020)
  Total
272,912
  Estimate 
(2023)
272,848
  Density590/sq mi (230/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district2nd
Websitewww.sjcindiana.gov
 
  • Indiana county number 71
  • Fifth-most populous county in Indiana as of 2010

St. Joseph County, colloquially called St. Joe County by residents, is a county located in the U.S. state of Indiana. As of the 2020 census, the population was 272,912, making it the fifth-most populous county in Indiana. Formed in 1830, it was named for the St. Joseph River which flows through it to Lake Michigan. The county seat is South Bend. St. Joseph County is part of the South Bend–Mishawaka, IN–MI "Michiana", Metropolitan Statistical Area.