• county
  • FIPS 17007
  • Largest town: Belvidere

Boone County, Illinois

Boone County had 53,313 residents in the Census Vintage 2024 estimate, on 280.8 square miles of land. It ranks 26th of 102 in Illinois by population and 93rd by land area.

Population
53,313
#26 of 102 in Illinois · #971 in US
Area
280.8 sq mi
#93 of 102 in Illinois · #2,846 in US
Density
190 / sq mi
#16 of 102 in Illinois · #580 in US
Median household income
$83,129
#11 of 102 in Illinois · #366 in US

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

Boone County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Boone County

Boone County population, land area and income

Boone County had 53,313 residents in the Census Vintage 2024 estimate, on 280.8 square miles of land. It ranks 26th of 102 in Illinois by population and 93rd by land area. That works out to 189.9 people per square mile, 2.0 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Illinois has 24,447 residents, so Boone County is 2.2 times that size.

Its SAIPE 2023 median household income of $83,129 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

53,313

3144th1st

971st of 3,144 (US)

Land area

281 sq mi

3144th1st

2846th of 3,144 (US)

Density

189.9 / sq mi

3144th1st

580th of 3,144 (US)

Median household income

$83,129

3143rd1st

366th of 3,143 (US)

Rank within Illinois (102)

Population

53,313

102nd1st

26th of 102 (IL)

Land area

281 sq mi

102nd1st

93rd of 102 (IL)

Density

189.9 / sq mi

102nd1st

16th of 102 (IL)

Median household income

$83,129

102nd1st

11th of 102 (IL)

How Boone County's population changed since 2020

Boone County lost 26 residents between the July 2020 and July 2024 estimates, a drop of 0.0%. That ranks 17th 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, Boone County recorded 2,221 births and 2,081 deaths, a natural change of +140. Net international migration added +82 and net domestic migration, people moving to or from other US counties, came to -330. The largest single component was domestic migration, which removed 330 people.

53.3k202053.2k202153.1k202253.2k202353.3k2024
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
2,221
Deaths
2,081
Net international migration
+82
Net domestic migration
-330
Change, July 2023 to July 2024
+74

Where Boone County is

The Census internal point of Boone County is at 42.319000, -88.824300. 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 Boone 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: Boone County internal point. Dark pin: Springfield.

Internal point

Decimal
42.319000, -88.824300
DMS
42°19'8.40"N 88°49'27.48"W
UTM
16N 349670.3E 4686807.0N
Geohash
dp8bdzbn5
Plus code
86JH859G+J7

Towns in Boone County

5 incorporated places of 1,000+ people have residents in Boone County, 33,846 people together, or 63% of the county. Each figure counts only the part of the town inside Boone County; towns marked "part" extend into another county. The largest is Belvidere with 25,325.

  1. 01Belvidere25,325
  2. 02Poplar Grove5,165
  3. 03Loves Park (part)1,618
  4. 04Capron1,402
  5. 05Cherry Valley (part)336
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Boone County

The Census 2024 county adjacency file lists 6 neighbors for Boone County, including 2 across a state line. The most populous is McHenry County, IL, with 315,959 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 180.6 miles SSW of Boone County's internal point in a straight line. The nearest place of 100,000 or more is Rockford, IL (population 147,486), 12.9 miles away. The nearest place of 10,000 or more is Belvidere, IL (population 25,325), 4.9 miles away.

Boone County FIPS code

The FIPS code of Boone County is 17007: state code 17 for Illinois plus county code 007. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $83,129.

Questions people ask

What is the population of Boone County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 53,313. That is down 26 people (0.0%) from the July 2020 estimate of 53,339.

What is the FIPS code of Boone County?

17007. The first two digits (17) are Illinois; the last three (007) identify the county.

What is the largest town in Boone County?

Belvidere, with 25,325 residents inside Boone County in 2024.

Which counties border Boone County?

6 county-equivalents border it in the Census 2024 adjacency file: McHenry County, IL; Winnebago County, IL; Rock County, WI; Walworth County, WI; DeKalb County, IL; Ogle 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.