There are 5 cities in Warren County, Illinois.

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City
Rank
State
2024 Population
2020 Census
Annual Change
Density (mi²)
Area (mi²)
Monmouth1Illinois8,4088,895-1.42%2,0024.20
Roseville2Illinois836890-1.65%1,1310.74
Alexis3Illinois757790-1.05%1,5940.47
Kirkwood4Illinois636676-1.55%6770.94
Little York5Illinois267285-1.48%1,1970.22
showing: 5 rows

Cities in Warren County, Illinois by Population (2024)

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.

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