Union County, Illinois Cities (2025)

5 cities

City
Rank
2025 Pop. ↓
2020 Pop.
Annual Change
Density
Area (mi²)
Type
Anna14,1354,282-0.72%1,1204 City
Jonesboro21,6421,704-0.79%6083 City
Cobden31,0321,072-0.77%8461 Village
Dongola4641661-0.62%5891 Village
Alto Pass5303312-0.66%1422 Village

Union County Cities Summary

Largest City

Anna is the largest city in Union County, with a population of 4,135.

Smallest City

Alto Pass is the smallest city in Union County, with a population of 303.

10 Largest Cities

There are 5 cities in Union County, Illinois.

Location of Union County