Dearborn County, Indiana

Dearborn County, Indiana
Location within the U.S. state of Indiana
Coordinates: 39°09′N 84°59′W / 39.15°N 84.98°W / 39.15; -84.98
Country United States
State Indiana
Founded1803
Named afterDr. Henry Dearborn
SeatLawrenceburg
Largest cityLawrenceburg
Area
 • Total
307.42 sq mi (796.2 km2)
 • Land305.03 sq mi (790.0 km2)
 • Water2.38 sq mi (6.2 km2)  0.77%
Population
 (2020)
 • Total
50,679
 • Estimate 
(2024)
51,435
 • Density166.14/sq mi (64.149/km2)
DemonymDearbornian
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district6th
Websitewww.dearborncounty.org
Indiana county number 15

Dearborn County is one of 92 counties of the U.S. state of Indiana. Located on the Ohio border near the southeast corner of the state, Dearborn County was formed in 1803 from a portion of Hamilton County, Ohio. In 2020, the population was 50,679. The county seat and largest city is Lawrenceburg. Dearborn County is part of the Cincinnati, OH-KY-IN Metropolitan Statistical Area.