Boone County, Illinois
Boone County, Illinois, has 53,568 residents (July 2025 estimate). Its county seat is Belvidere. It uses Central Time and covers 281 sq mi (727 km²) of land.
- Resident population, July 2025
- 53,568
- Land area
- 281 sq mi (727 km²)
- County seat or government
- Belvidere
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $84,571 ± $4,441
- Median home value
- $216,900 ± $9,736
- Median rent, with utilities
- $1,041 ± $69
- Homes lived in by their owners
- 81.8% ± 2.2 points
- County type
- County
- Metro or micro area
- Rockford, IL metro areaCentral county
- Water area
- 1.29 sq mi (3.34 km²)
- State
- Illinois
- County code (FIPS)
- 17007
- Coordinates (central point)
- 42.318983, -88.824295
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Boone County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 6100833,582 people
- 6110730,765 people
- 6111123,286 people
- 6107320,194 people
- 6111415,325 people
- 6003312,999 people
- 6108010,955 people
- 6106510,570 people
- 601357,274 people
- 610165,465 people
- 610112,676 people
- 601452,464 people
15 ZIP Code areas overlap Boone County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
Boone County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Townships in Boone County, largest first
- Belvidere Township29,286 people
- Caledonia Township7,239 people
- Poplar Grove Township5,150 people
- Bonus Township4,363 people
- Flora Township2,988 people
- Boone Township2,108 people
- Spring Township1,009 people
- Manchester Township697 people
- LeRoy Township390 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county
School districts in Boone County, largest first
- Rockford School District 205185,237 people
- Belvidere Consolidated Unit School District 10044,668 people
- Hononegah Community High School District 20733,111 people
- Kinnikinnick Community Consolidated School District 13113,768 people
- Harvard Community Unit School District 5012,865 people
- North Boone Community Unit School District 2008,381 people
- Hiawatha Community Unit School District 4262,603 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Belvidere, Illinois (city)24,752 people
- Loves Park, Illinois (city)23,502 people
- Candlewick Lake, Illinois (CDP)5,448 people
- Poplar Grove, Illinois (village)3,923 people
- Cherry Valley, Illinois (village)3,749 people
- Capron, Illinois (village)1,311 people
- Timberlane, Illinois (village)1,278 people
- Garden Prairie, Illinois (CDP)403 people
- Argyle, Illinois (CDP)324 people
- Caledonia, Illinois (village)226 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Winnebago County, Illinois17 mi west
- McHenry County, Illinois19 mi east
- Rock County, Wisconsin27 mi northwest
- Walworth County, Wisconsin28 mi northeast
- DeKalb County, Illinois29 mi south
- Ogle County, Illinois32 mi southwest
Before using this answer on a form
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