Jefferson County , Illinois

Jefferson County: County in Illinois, United States

Jefferson County locator map
Location of Jefferson County on Illinois map.

About

Jefferson County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 38,827 and a population density of 26 people per km². After 9 years in 2019 county had an estimated population of 37,684 inhabitants. Its county seat is Mount Vernon. The county was created 202 years ago in 1818.

Geography

Jefferson County is located at 38°18'2"N 88°55'26"W (38.3005200, -88.9240100). It has 6 neighbors: Franklin County, Hamilton County, Marion County, Perry County, Washington County and Wayne County.

Jefferson County Courthouse in Mount Vernon image
Jefferson County Courthouse in Mount Vernon

The largest city of Jefferson County is Mount Vernon with a population of 12,897. Other cities include, Woodlawn population 682, Dix population 440, Waltonville population 432 and Harmony population 302. See all Jefferson County cities & populated places.

Weather

Jefferson County forecast: A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. North northwest wind around 5 mph. more

Jefferson County Courthouse in Mount Vernon image

Jefferson County map

Jefferson County Quick Facts

Population : 37,684 (2019)
Country : United States of America
State : Illinois (United States)
Different from : Jefferson County, Jefferson Parish, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County
Area : 1512 km2
Water as percent of area : 2.2%
Land as percent of area : 97.8%
Named for : Thomas Jefferson
Capital : Mount Vernon
Establishment : January 01, 1819
Time Zone : America/Chicago
Local time : 05:24:20 (1st August 2021)
Density : 25 Pop. per km² as of 2019
Population growth : -3.03% (2010-2019)
Weather : 84℉ Chance Showers And Thunderstorms 7-days weather

Jefferson County has 6 neighbours.

  • Mount Vernon

Demographics

According to census records, the population of Jefferson County decreased by 3.03% in 9 years.

Year Population % Change Method
2010 38,827 - census
2011 38,749 -0.2% estimation process
2012 38,658 -0.24% estimation process
2013 38,641 -0.04% estimation process
2014 38,374 -0.7% estimation process
2015 38,272 -0.27% estimation process
2016 38,214 -0.15% estimation process
2017 38,045 -0.44% estimation process
2018 37,708 -0.89% estimation process
2019 37,684 -0.06% estimation process

Comitatul Jefferson, Comte de Jefferson, Comté de Jefferson, Condado de Jefferson, Condado han Jefferson, Contea di Jefferson, Dzhefersun, Dzhefferson, Hrabstwo Jefferson, Jefferson, Jefferson Comitatus, Jefferson Kun, Jefferson Kūn, Jefferson konderria, Jefferson megye, Jefferson srjan, Jeffersoni maakond, Okrug DZeferson, Quan Jefferson, Quận Jefferson, jefason jun, jepharasana ka'unti, jie fu xun xian, mqatʿt jyfyrswn, shhrstan jfrswn aylynwy, Джеферсън, Джефферсон, Округ Џеферсон, Ջեֆֆերսոն շրջան, جیفرسن کاؤنٹی، الینوائے, جیفرسن کاؤنٹی، الینوۓ, شهرستان جفرسون، ایلینوی, مقاطعة جيفيرسون, জেফারশন কাউন্টি, ジェファーソン郡, 傑佛遜縣

People born in Jefferson County (1)

American politician Newton R. Casey was born in Jefferson County

Other places with the same name (24)

Jefferson County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Jefferson County.

City Name Population Title
Shields 36,427 Township in Lake County, Illinois
Mount Vernon 12,897 City located near the center of Jefferson County, Illinois, United States
Spring Garden 3,221 Township in Jefferson County, Illinois
Ina 2,279 Village in Jefferson County, United States
Woodlawn 682 Community in the city of Birmingham, Jefferson County, Alabama, United States
Bluford 669 Village in the United States
Dix 440 City in Illinois, United States of America
Stratton 438 Township in Edgar County, Illinois
Waltonville 432 Human settlement in Illinois, United States of America
Bonnie 381 Village in Illinois
Belle Rive 350 Village Jefferson County, Illinois, United States
Harmony 302 Unincorporated community in Illinois
Nason 233 City in Jefferson County, Illinois

Illinois Other Counties (more counties)

County Name Population Title
Illinois 12,671,821 State of the United States of America
Cook County 5,150,233 County in Illinois, United States
Chicago 2,693,976 City and county seat of Cook County, Illinois, United States
DuPage County 922,921 County in Illinois, United States
Lake County 696,535 County in Oregon, United States
Will County 690,743 County in Illinois, United States
Kane County 532,403 County in southern Utah, United States
Markham 328,966 City in Cook County, Illinois, United States
McHenry County 307,774 County in Illinois, United States
Winnebago County 282,572 County in Illinois, United States
Madison County 262,966 County in Montana, United States
Saint Clair County 259,686 The County of St.
Champaign County 209,689 County in Illinois, United States
Sangamon County 194,672 County in Illinois, United States
Peoria County 179,179 County in Illinois, United States of America
McLean County 171,517 County in North Dakota, United States

Next page