Warren 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
Monmouth18,4578,896-1.28%1,9944.2City
Roseville2843890-1.4%1,1410.7Village
Kirkwood3638676-1.54%6790.9Village
Cameron43861467.52%6100.6CDP
Little York5268284-1.47%1,2020.2Village

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 Warren County, Illinois?

Monmouth is the largest city in Warren County.

What is the smallest city in Warren County, Illinois?

Little York is the smallest city in Warren County.

How many cities are in Warren County?

There are 5 cities in Warren County, Illinois.

Frequently Asked Questions