Jersey County, Illinois Cities (2026)

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density (/mi²)
Area (mi²)
Type
Jerseyville18,4148,3250.06%1,6075 City
Grafton28046514.01%2174 City
Elsah3537525-0.37%4921 Village
Medora4363372-0.55%9550 Village
Fieldon5157169-1.26%7770 Village
Fidelity695100-1.04%9410 Village

Jersey County Cities Summary

Largest City

Jerseyville is the largest city in Jersey County, with a population of 8,414.

Smallest City

Fidelity is the smallest city in Jersey County, with a population of 95.

10 Largest Cities

There are 6 cities in Jersey County, Illinois.

Location of Jersey County