Jefferson County Map
The County of Jefferson is located in the State of Illinois. Find directions to Jefferson County, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2020 US Census the Jefferson County population is estimated at 37,235 people. The Jefferson County time zone is Central Daylight Time which is 6 hours behind Coordinated Universal Time (UTC).
Nearby counties include Franklin County, Hamilton County, Marion County, Perry County, Washington County, Wayne County.
Top cities include Mount Vernon, Ina, Woodlawn, Bluford, Dix