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English: This is a locator map showing Jefferson County in Illinois. For more information, see Commons:United States county locator maps. Date: 12 February 2006:
Jefferson County is a county located in the southern part of the U.S. state of Illinois. According to the 2020 census, it has a population of 37,113. [1] The county seat is Mount Vernon. [2] Jefferson County contains the Mount Vernon, Illinois micropolitan area. It is located in the southern portion known locally as "Little Egypt".
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Mount Vernon Township is one of sixteen townships in Jefferson County, Illinois, USA. As of the 2010 census, its population was 13,374 and it contained 6,422 housing units. As of the 2010 census, its population was 13,374 and it contained 6,422 housing units.
Mount Vernon is a city in and the county seat of Jefferson County, Illinois, United States. [4] The population was 14,600 at the 2020 census.Mount Vernon is the principal city of the Mount Vernon Micropolitan Statistical Area, which includes all of Jefferson and Hamilton counties.
Populated places in Jefferson County, Illinois (5 C) Protected areas of Jefferson County, Illinois (4 P) Pages in category "Geography of Jefferson County, Illinois"