Sullivan County
Also known as Sullivan County, Missouri, Sullivan County, MO
county in Missouri, United States
Key facts
- Country
- United States
- State
- Missouri
- Founded
- 1843 (created), 1845 (organized)
- Named after
- John Sullivan
- Seat
- Milan
- Largest city
- Milan
- Total
- 652 sq mi (1,690 km )
- Land
- 648 sq mi (1,680 km )
- Water
- 3.5 sq mi (9.1 km ) 0.5%
- Estimate 2025
- 5,738
- Density
- 9.26/sq mi (3.57/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
Article
Sullivan County is a county located in the northern portion of the U.S. state of Missouri. As of the 2020 census, the population was 5,999. Its county seat is Milan. The county was organized February 14, 1845, and named for Major General John Sullivan of the American Revolutionary War.
History