Boone County, Illinois
County seat: Belvidere · Population 53,568 (2025) · 281 sq mi
Boone County is the 26th most populous of Illinois's 102 counties, with 53,568 people (2025 estimate). Its county seat is Belvidere. It is part of the Northern Stateline region, one of the 10 Illinois economic development regions (DCEO). The map shows its 7 cities and towns and the 6 neighboring counties.
Boone County facts
- County seat
- Belvidere
- Population (2025 estimate)
- 53,568 +0.2% since 2020
- Land area
- 281 sq mi 93rd largest of 102
- Water area
- 1 sq mi
- Population density
- 191 per sq mi
- Established
- 1837
- Same name
- One of 8 Boone Counties in the US
- Named after
- Daniel Boone American pioneer and frontiersman (1734–1820)
- Largest city
- Belvidere 25,462
- Median household income
- $84,571
- Cities and towns
- 7 plus 3 CDPs
- ZIP codes
- 15
- Time zone
- Central
- FIPS code
- 17007
Cities and towns in Boone County
Boone County has 7 incorporated cities, towns and villages. Populations count the people living inside Boone County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Belvidere (county seat) | City | 25,462 | |
| Poplar Grove | Village | 5,206 | |
| Loves Park | City | 1,626 | Winnebago County |
| Capron | Village | 1,407 | |
| Timberlane | Village | 908 | |
| Cherry Valley | Village | 340 | Winnebago County |
| Caledonia | Village | 183 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Candlewick Lake | 5,448 | |
| Garden Prairie | 403 | |
| Argyle | 110 | Winnebago County |
ZIP codes in Boone County
15 ZIP codes reach into Boone County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 60033 also McHenry County
- 60135 also DeKalb and McHenry counties
- 60145 also DeKalb County
- 60146 also DeKalb and Ogle counties
- 61008 also Winnebago County
- 61011 also Winnebago County
- 61012
- 61016 also Winnebago County
- 61038 also McHenry County
- 61065
- 61073 also Winnebago County
- 61080 also Winnebago County
- 61107 also Winnebago County
- 61111 also Winnebago County
- 61114 also Winnebago County
Population of Boone County, 2020–2025
Boone County grew by 122 people (+0.2%) between April 2020 and July 2025: 210 more births than deaths and a net loss of 60 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 53,344 |
| 2021 | 53,188 |
| 2022 | 53,096 |
| 2023 | 53,352 |
| 2024 | 53,526 |
| 2025 | 53,568 |
Neighboring counties
- Winnebago County west · 283,674 people
- McHenry County east · 317,751 people
- DeKalb County south · 101,835 people
- Rock County, Wisconsin northwest · 166,472 people
- Walworth County, Wisconsin northeast · 106,127 people
- Ogle County southwest · 51,399 people
Printable Boone County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (95 KB)
- PNG (2400 px) (73 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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