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Jefferson County
Also known as Jefferson County, Indiana, Jefferson County, IN
county in Indiana, United States
Key facts
- Country
- United States
- State
- Indiana
- Named after
- Thomas Jefferson
- Seat
- Madison
- Largest city
- Madison
- Total
- 362.89 sq mi (939.9 km )
- Land
- 360.63 sq mi (934.0 km )
- Water
- 2.26 sq mi (5.9 km ) 0.62%
- Estimate 2025
- 33,279
- Density
- 91.914/sq mi (35.488/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
- Congressional district
~9 min read
Article
Jefferson County is a county located in the U.S. state of Indiana. As of 2020, the population was 33,147. The county seat is Madison.
History