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County · code 17007

Boone CountyIllinois

Boone County, Illinois, was formed in 1837 and is located in the northern part of the state with Belvidere as its county seat.

  • Founded1837
  • County seatBelvidere
  • Named forDaniel Boone
  • Land area281 sq mi + 1.3 sq mi water
  • Population53,448 2020 Census
  • Parcels mapped24,319 checked 15 October 2026
Open the free map Click any parcel in Boone County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

WinnebagoMcHenryDeKalbWalworth, WI Belvidere Census outline · seat marked

Where it is

Boone on the map of Illinois

Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAlexander CountyBond CountyBrown CountyBureau CountyCalhoun CountyCarroll CountyCass CountyChampaign CountyChristian CountyClark CountyClay CountyClinton CountyColes CountyCook CountyCrawford CountyCumberland CountyDeKalb CountyDe Witt CountyDouglas CountyDuPage CountyEdgar CountyEdwards CountyEffingham CountyFayette CountyFord CountyFranklin CountyFulton CountyGallatin CountyGreene CountyGrundy CountyHamilton CountyHancock CountyHardin CountyHenderson CountyHenry CountyIroquois CountyJackson CountyJasper CountyJefferson CountyJersey CountyJo Daviess CountyJohnson CountyKane CountyKankakee CountyKendall CountyKnox CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan CountyMcDonough CountyMcHenry CountyMcLean CountyMacon CountyMacoupin CountyMadison CountyMarion CountyMarshall CountyMason CountyMassac CountyMenard CountyMercer CountyMonroe CountyMontgomery CountyMorgan CountyMoultrie CountyOgle CountyPeoria CountyPerry CountyPiatt CountyPike CountyPope CountyPulaski CountyPutnam CountyRandolph CountyRichland CountyRock Island CountySt. Clair CountySaline CountySangamon CountySchuyler CountyScott CountyShelby CountyStark CountyStephenson CountyTazewell CountyUnion CountyVermilion CountyWabash CountyWarren CountyWashington CountyWayne CountyWhite CountyWhiteside CountyWill CountyWilliamson CountyWinnebago CountyWoodford CountyBoone County Boone
Counties of Illinois · Boone highlighted

History

Formed in 1837 from Winnebago County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Boone County was created on March 4, 1837, from Winnebago County and was named after Daniel Boone. The county gained additional territory from Winnebago County on May 22, 1843.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1837
    Boone County created Boone created from Winnebago.
    from Winnebago
    · Ill. Laws 1836-1837, pp. 96-100
  2. 1839
    Changed Legislature authorized Boone to gain from McHenry townships 43 to 46 north, range 5 east, dependent on local referendum that failed (no change).
    McHenry
    · Ill. Laws 1838-1839, p. 242
  3. 1843
    Gained territory Boone gained from Winnebago.
    from Winnebago
    · Ill. Laws 1842-1843, p. 92

Land and parcels

What the maps cover in Boone

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Boone by the Census

Population
53,448 2020 Census count
Housing units
20,157 2020 Census count
Land area
281 square miles
Water area
1.3 square miles
People per sq mi
190 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Permits

Zoning and code

County government

See your own lot on these maps

Open Boone County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Boone County

When was Boone County founded?
Boone County was founded in 1837, formed from Winnebago County, and named after Daniel Boone.
What is the county seat of Boone County?
The county seat of Boone County is Belvidere.
Is there an online parcel map for Boone County?
Yes. Boone County publishes a parcel map of 24,319 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Boone County's boundary or name changed?
Boone County was created in 1837 from Winnebago County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Winnebago County.
Who issues building permits in Boone County?
The county's page on building permits: Cremation Permits. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Boone County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door