• county
  • FIPS 17015
  • Largest town: Savanna

Carroll County, Illinois

Carroll County had 15,444 residents in the Census Vintage 2024 estimate, on 445.4 square miles of land. It ranks 67th of 102 in Illinois by population and 60th by land area.

Population
15,444
#67 of 102 in Illinois · #2,067 in US
Area
445.4 sq mi
#60 of 102 in Illinois · #2,285 in US
Density
35 / sq mi
#68 of 102 in Illinois · #1,798 in US
Median household income
$61,982
#74 of 102 in Illinois · #1,644 in US

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

Carroll County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Carroll County

Carroll County population, land area and income

Carroll County had 15,444 residents in the Census Vintage 2024 estimate, on 445.4 square miles of land. It ranks 67th of 102 in Illinois by population and 60th by land area. That works out to 34.7 people per square mile, below the US average of 96.3, and below the national county median.

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

Its SAIPE 2023 median household income of $61,982 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

15,444

3144th1st

2067th of 3,144 (US)

Land area

445 sq mi

3144th1st

2285th of 3,144 (US)

Density

34.7 / sq mi

3144th1st

1798th of 3,144 (US)

Median household income

$61,982

3143rd1st

1644th of 3,143 (US)

Rank within Illinois (102)

Population

15,444

102nd1st

67th of 102 (IL)

Land area

445 sq mi

102nd1st

60th of 102 (IL)

Density

34.7 / sq mi

102nd1st

68th of 102 (IL)

Median household income

$61,982

102nd1st

74th of 102 (IL)

How Carroll County's population changed since 2020

Carroll County lost 234 residents between the July 2020 and July 2024 estimates, a drop of 1.5%. That ranks 45th 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, Carroll County recorded 523 births and 960 deaths, a natural change of -437. Net international migration added +30 and net domestic migration, people moving to or from other US counties, came to +149. The largest single component was natural change, which removed 437 people.

15.7k202015.7k202115.6k202215.5k202315.4k2024
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
523
Deaths
960
Net international migration
+30
Net domestic migration
+149
Change, July 2023 to July 2024
-48

Where Carroll County is

The Census internal point of Carroll County is at 42.070900, -89.924200. 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 Carroll 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: Carroll County internal point. Dark pin: Springfield.

Internal point

Decimal
42.070900, -89.924200
DMS
42°04'15.24"N 89°55'27.12"W
UTM
16N 258082.8E 4661786.6N
Geohash
dp2p3dz0y
Plus code
86JG33CG+98

Towns in Carroll County

4 incorporated places of 1,000+ people have residents in Carroll County, 7,204 people together, or 47% of the county. Each figure counts only the part of the town inside Carroll County; towns marked "part" extend into another county. The largest is Savanna with 2,713.

  1. 01Savanna2,713
  2. 02Thomson1,595
  3. 03Lanark1,463
  4. 04Mount Carroll1,433
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Carroll County

The Census 2024 county adjacency file lists 6 neighbors for Carroll County, including 2 across a state line. The most populous is Whiteside County, IL, with 54,657 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 158.9 miles S of Carroll County's internal point in a straight line. The nearest place of 100,000 or more is Rockford, IL (population 147,486), 46.0 miles away. The nearest place of 10,000 or more is Freeport, IL (population 23,140), 21.1 miles away.

Carroll County FIPS code

The FIPS code of Carroll County is 17015: state code 17 for Illinois plus county code 015. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $61,982.

Questions people ask

What is the population of Carroll County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 15,444. That is down 234 people (1.5%) from the July 2020 estimate of 15,678.

What is the FIPS code of Carroll County?

17015. The first two digits (17) are Illinois; the last three (015) identify the county.

What is the largest town in Carroll County?

Savanna, with 2,713 residents inside Carroll County in 2024.

Which counties border Carroll County?

6 county-equivalents border it in the Census 2024 adjacency file: Whiteside County, IL; Ogle County, IL; Clinton County, IA; Stephenson County, IL; Jo Daviess County, IL; Jackson County, IA.

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.