• county
  • FIPS 17083
  • Largest town: Jerseyville

Jersey County, Illinois

Jersey County had 21,150 residents in the Census Vintage 2024 estimate, on 369.6 square miles of land. It ranks 55th of 102 in Illinois by population and 81st by land area.

Population
21,150
#55 of 102 in Illinois · #1,763 in US
Area
369.6 sq mi
#81 of 102 in Illinois · #2,632 in US
Density
57 / sq mi
#43 of 102 in Illinois · #1,348 in US
Median household income
$70,158
#38 of 102 in Illinois · #991 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Jersey County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Jersey County

Jersey County population, land area and income

Jersey County had 21,150 residents in the Census Vintage 2024 estimate, on 369.6 square miles of land. It ranks 55th of 102 in Illinois by population and 81st by land area. That works out to 57.2 people per square mile, below the US average of 96.3, and above the national county median.

The median county-equivalent in Illinois has 24,447 residents; Jersey County is somewhat smaller.

Its SAIPE 2023 median household income of $70,158 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

21,150

3144th1st

1763rd of 3,144 (US)

Land area

370 sq mi

3144th1st

2632nd of 3,144 (US)

Density

57.2 / sq mi

3144th1st

1348th of 3,144 (US)

Median household income

$70,158

3143rd1st

991st of 3,143 (US)

Rank within Illinois (102)

Population

21,150

102nd1st

55th of 102 (IL)

Land area

370 sq mi

102nd1st

81st of 102 (IL)

Density

57.2 / sq mi

102nd1st

43rd of 102 (IL)

Median household income

$70,158

102nd1st

38th of 102 (IL)

How Jersey County's population changed since 2020

Jersey County lost 342 residents between the July 2020 and July 2024 estimates, a drop of 1.6%. That ranks 48th of 102 in Illinois for growth. The median Illinois county changed by -1.7%, and the state as a whole by -0.7%.

Since the April 2020 estimates base, Jersey County recorded 743 births and 1,276 deaths, a natural change of -533. Net international migration added +92 and net domestic migration, people moving to or from other US counties, came to +72. The largest single component was natural change, which removed 533 people.

21.5k202021.4k202121.2k202221.2k202321.2k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
743
Deaths
1,276
Net international migration
+92
Net domestic migration
+72
Change, July 2023 to July 2024
-8

Where Jersey County is

The Census internal point of Jersey County is at 39.080200, -90.361400. It sits in UTM zone 15N. The map shades Illinois's 102 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Jersey County outlined. Dots are towns of 1,000+ people with residents in it.

Piatt County: -0.3%Hamilton County: -2.2%Williamson County: -0.1%Edgar County: -2.4%Macoupin County: -2.3%Marshall County: -1.3%Putnam County: +0.0%Richland County: -2.8%Washington County: -1.4%Lee County: -1.5%Douglas County: +0.2%Cook County: -1.6%Effingham County: -0.3%Edwards County: -3.6%Cass County: -2.0%Clay County: -3.4%Knox County: -2.2%LaSalle County: -0.9%Cumberland County: -1.3%Warren County: -3.7%Moultrie County: -0.9%Menard County: -2.5%Fayette County: -1.5%Boone County: -0.0%Lawrence County: -3.2%Marion County: -3.2%Champaign County: +3.0%Clark County: -2.4%Ford County: -0.4%Wayne County: -1.4%Logan County: -1.4%Grundy County: +2.5%Jasper County: -1.8%Crawford County: -1.3%McDonough County: -1.7%Clinton County: +0.5%Perry County: -3.0%Montgomery County: -2.2%Henry County: -2.0%Livingston County: -1.2%Scott County: -3.8%Alexander County: -11.2%Bureau County: -2.2%Brown County: +1.1%Mason County: -3.9%Calhoun County: -4.1%Greene County: -4.3%Coles County: -1.4%Kendall County: +8.2%Lake County: +0.7%Mercer County: -2.2%St. Clair County: -2.3%Wabash County: -3.0%Bond County: -1.7%DuPage County: +0.6%Gallatin County: -5.2%Stephenson County: -3.3%McHenry County: +1.9%White County: -3.0%Saline County: -3.9%Christian County: -2.2%Sangamon County: -1.0%Massac County: -3.6%Macon County: -2.9%Johnson County: -0.0%Jo Daviess County: -2.6%Peoria County: -1.0%DeKalb County: +1.0%Pope County: -1.5%De Witt County: -0.9%Schuyler County: -1.7%Fulton County: -3.1%Ogle County: -0.8%Jersey County: -1.6%Iroquois County: -3.3%Kankakee County: -0.9%Rock Island County: -1.1%Pulaski County: -5.8%Kane County: +0.9%Union County: -2.4%Whiteside County: -1.7%Woodford County: -0.3%Carroll County: -1.5%Adams County: -2.3%Hardin County: -2.6%Madison County: -1.0%Hancock County: -3.1%Monroe County: +0.0%Tazewell County: -1.1%Jackson County: -0.1%Vermilion County: -3.9%Randolph County: -0.6%McLean County: +0.5%Morgan County: -2.6%Shelby County: -1.7%Will County: +1.7%Winnebago County: -0.4%Jefferson County: -2.4%Stark County: -2.2%Henderson County: -4.5%Pike County: -2.6%Franklin County: -1.8%
Change 2020 to 2024
  1. < -3.0%
  2. < -2.2%
  3. < -1.4%
  4. < -0.3%
  5. ≥ -0.3%
no data

Orange pin: Jersey County internal point. Dark pin: Springfield.

Internal point

Decimal
39.080200, -90.361400
DMS
39°04'48.72"N 90°21'41.04"W
UTM
15N 728239.6E 4328990.9N
Geohash
9yzwrf2fd
Plus code
86FF3JJQ+3C

Towns in Jersey County

2 incorporated places of 1,000+ people have residents in Jersey County, 8,647 people together, or 41% of the county. Each figure counts only the part of the town inside Jersey County; towns marked "part" extend into another county. The largest is Jerseyville with 8,350.

  1. 01Jerseyville8,350
  2. 02Brighton (part)297
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Jersey County

The Census 2024 county adjacency file lists 5 neighbors for Jersey County, including 1 across a state line. The most populous is St. Charles County, MO, with 423,726 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 61.5 miles NE of Jersey County's internal point in a straight line. The nearest place of 100,000 or more is St. Louis, MO (population 279,695), 31.4 miles away. The nearest place of 10,000 or more is Godfrey, IL (population 17,610), 11.6 miles away.

Jersey County FIPS code

The FIPS code of Jersey County is 17083: state code 17 for Illinois plus county code 083. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $70,158.

Questions people ask

What is the population of Jersey County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 21,150. That is down 342 people (1.6%) from the July 2020 estimate of 21,492.

What is the FIPS code of Jersey County?

17083. The first two digits (17) are Illinois; the last three (083) identify the county.

What is the largest town in Jersey County?

Jerseyville, with 8,350 residents inside Jersey County in 2024.

Which counties border Jersey County?

5 county-equivalents border it in the Census 2024 adjacency file: St. Charles County, MO; Madison County, IL; Macoupin County, IL; Greene County, IL; Calhoun County, IL.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.