Boone County, Illinois Cities (2024)

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

City
Rank
2024 Pop.
2020 Pop.
Change
Density (/mi²)
Area (mi²)
Type
Belvidere125,30125,2830.02%2,02212.5City
Candlewick Lake25,9275,3517.7%3,2061.8CDP
Poplar Grove35,1535,0560.47%6547.9Village
Capron41,3971,3880.14%1,8100.8Village
Timberlane5902904-0.11%5171.7Village
Argyle66723537.69%7660.9CDP
Chemung73997381.79%1,4200.3CDP
Garden Prairie83832657.89%6000.6CDP
Lawrence92341507.34%6360.4CDP
Caledonia10179182-0.56%1731.0Village

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Boone County, Illinois?

Belvidere is the largest city in Boone County.

What is the smallest city in Boone County, Illinois?

Caledonia is the smallest city in Boone County.

How many cities are in Boone County?

There are 10 cities in Boone County, Illinois.

Frequently Asked Questions