• county
  • FIPS 17157
  • Largest town: Chester

Randolph County, Illinois

Randolph County had 29,903 residents in the Census Vintage 2024 estimate, on 575.4 square miles of land. It ranks 47th of 102 in Illinois by population and 39th by land area.

Population
29,903
#47 of 102 in Illinois · #1,446 in US
Area
575.4 sq mi
#39 of 102 in Illinois · #1,723 in US
Density
52 / sq mi
#44 of 102 in Illinois · #1,429 in US
Median household income
$70,526
#35 of 102 in Illinois · #964 in US

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

Randolph County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Randolph County

Randolph County population, land area and income

Randolph County had 29,903 residents in the Census Vintage 2024 estimate, on 575.4 square miles of land. It ranks 47th of 102 in Illinois by population and 39th by land area. That works out to 52.0 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; Randolph County is somewhat larger.

Its SAIPE 2023 median household income of $70,526 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

29,903

3144th1st

1446th of 3,144 (US)

Land area

575 sq mi

3144th1st

1723rd of 3,144 (US)

Density

52.0 / sq mi

3144th1st

1429th of 3,144 (US)

Median household income

$70,526

3143rd1st

964th of 3,143 (US)

Rank within Illinois (102)

Population

29,903

102nd1st

47th of 102 (IL)

Land area

575 sq mi

102nd1st

39th of 102 (IL)

Density

52.0 / sq mi

102nd1st

44th of 102 (IL)

Median household income

$70,526

102nd1st

35th of 102 (IL)

How Randolph County's population changed since 2020

Randolph County lost 181 residents between the July 2020 and July 2024 estimates, a drop of 0.6%. That ranks 25th 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, Randolph County recorded 1,238 births and 1,706 deaths, a natural change of -468. Net international migration added +313 and net domestic migration, people moving to or from other US counties, came to -96. The largest single component was natural change, which removed 468 people.

30.1k202030.2k202130.1k202230.0k202329.9k2024
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
1,238
Deaths
1,706
Net international migration
+313
Net domestic migration
-96
Change, July 2023 to July 2024
-90

Where Randolph County is

The Census internal point of Randolph County is at 38.056500, -89.821200. It sits in UTM zone 16N. The map shades Illinois's 102 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Randolph 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: Randolph County internal point. Dark pin: Springfield.

Internal point

Decimal
38.056500, -89.821200
DMS
38°03'23.40"N 89°49'16.32"W
UTM
16N 252472.1E 4215842.2N
Geohash
dnb0kpfpn
Plus code
86CG354H+JG

Towns in Randolph County

4 incorporated places of 1,000+ people have residents in Randolph County, 16,457 people together, or 55% of the county. Each figure counts only the part of the town inside Randolph County; towns marked "part" extend into another county. The largest is Chester with 6,759.

  1. 01Chester6,759
  2. 02Sparta4,040
  3. 03Red Bud3,763
  4. 04Steeleville1,895
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Randolph County

The Census 2024 county adjacency file lists 7 neighbors for Randolph County, including 2 across a state line. The most populous is St. Clair County, IL, with 251,149 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 119.5 miles N of Randolph County's internal point in a straight line. The nearest place of 100,000 or more is St. Louis, MO (population 279,695), 46.1 miles away. The nearest place of 10,000 or more is Waterloo, IL (population 11,165), 26.7 miles away.

Randolph County FIPS code

The FIPS code of Randolph County is 17157: state code 17 for Illinois plus county code 157. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $70,526.

Questions people ask

What is the population of Randolph County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 29,903. That is down 181 people (0.6%) from the July 2020 estimate of 30,084.

What is the FIPS code of Randolph County?

17157. The first two digits (17) are Illinois; the last three (157) identify the county.

What is the largest town in Randolph County?

Chester, with 6,759 residents inside Randolph County in 2024.

Which counties border Randolph County?

7 county-equivalents border it in the Census 2024 adjacency file: St. Clair County, IL; Jackson County, IL; Monroe County, IL; Perry County, IL; Perry County, MO; Ste. Genevieve County, MO; Washington 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.