Sullivan County, Indiana

county in Indiana, United States

Sullivan County is a county in the U.S. state of Indiana. As of 2020, 20,817 people lived there.[1] The county seat is Sullivan.[2]

Sullivan County
Sullivan County Courthouse
Sullivan County Courthouse
Map of Indiana highlighting Sullivan County
Location within the U.S. state of Indiana
Map of the United States highlighting Indiana
Indiana's location within the U.S.
Coordinates: 39°05′N 87°25′W / 39.09°N 87.41°W / 39.09; -87.41
Country United States
State Indiana
FoundedJanuary 15, 1817 (created)
February 1817 (organized)
Named forGeneral Daniel Sullivan
Largest citySullivan
 • Total454.12 sq mi (1,176.2 km2)
 • Land447.14 sq mi (1,158.1 km2)
 • Water6.97 sq mi (18.1 km2)  1.53%
 • Total20,817
 • Density46.3/sq mi (17.9/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district8th
Indiana county number 77


  1. 1.0 1.1 "QuickFacts: Sullivan County, Indiana". United States Census Bureau. Retrieved September 27, 2023.
  2. "Find a County". National Association of Counties. Retrieved 2011-06-07.