Jersey County, Illinois Cities (2025)

6 cities

City
Rank
2025 Pop. ↓
2020 Pop.
Change
Density
Area (mi²)
Type
Jerseyville18,2238,323-0.24%1,5705.24 City
Grafton28496385.2%2293.71 City
Elsah3514523-0.39%4711.09 Village
Medora4362374-0.55%9530.38 Village
Fieldon5160175-1.84%7920.20 Village
Fidelity698980%9700.10 Village

Jersey County Cities Summary

Largest City

Jerseyville is the largest city in Jersey County, with a population of 8,223.

Smallest City

Fidelity is the smallest city in Jersey County.

10 Largest Cities

There are 6 cities in Jersey County, Illinois.