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Sullivan County is a county located in the northern portion of the state of Missouri. Based on the 2010 census, the population was 6,714. Its county seat is Milan. The county was organized February 14, 1845 and named for Major General John Sullivan of the American Revolutionary War.
Named for James Sullivan, a Revolutionary War general.
County QuickFacts: CensusBureau Quick Facts
Sullivan County was fully organized Febrary 16, 1843 and named by Hon. E.C. Morelock for his native county in Tennessee. In the preliminary organization the county had been named Highland. The county was named for General James Sullivan of Sullivan, Tennessee. General James Sullivan was a member of the Continental Congress of 1782. He died December 10, 1808. "The name Highland was dropped because it had originally been applied in derision of the pretensions of the early pioneers." HIST. ADAIR, p. 48; Eaton, p. 68; RECORD OF CHAR. COUNTY, pp. 21-2)
Source: Adams, Orvyl Guy. "Place Names In The North Central Counties Of Missouri." M.A. thesis., University of Missouri-Columbia, 1928.
As reported by the Census Bureau, the county has a total area of 652 square miles (1,690 km2), of which 648 square miles (1,680 km2) is
land and 3.5 square miles (9.1 km2) (0.5%) is water.
The main water courses in Sullivan County are Medicine, Locust, East Locust, Yellow, and Spring Creeks. The highest point in the county, about 1,060 feet (320 m) above sea level, is on the primary divide between the Chariton River and Grand River drainage basins along its northern border shared with Putnam County northwest of Green City. The lowest point, about 740 feet (230 m) above sea level, is where Locust Creek flows out of the county on its southern border with Linn County, near the town of Browning
Bordering counties are as follows:
Green City R-I School District - Green City
Milan C-2 School District - Milan
Newton-Harris R-III School District - Newtown