Sullivan is a city in Moultrie County, Illinois, United States. The population was 4,413 at the time of the 2020 census. It is the county seat and la…Sullivan is a city in Moultrie County, Illinois, United States. The population was 4,413 at the time of the 2020 census. It is the county seat and largest city of Moultrie County. Sullivan is named after Sullivan's Island, South Carolina, where Fort Moultrie is located.
Save
Share
More