Union County, Illinois Cities (2025)

5 cities

City
Rank
2025 Pop. ↓
2020 Pop.
Change
Density
Area (mi²)
Type
Anna14,0384,282-1.2%1,0933.69 City
Jonesboro21,6031,702-1.23%5942.70 City
Cobden31,0121,069-1.08%8301.22 Village
Dongola4625660-1.11%5741.09 Village
Alto Pass5298313-1%1402.13 Village

Union County Cities Summary

Largest City

Anna is the largest city in Union County, with a population of 4,038.

Smallest City

Alto Pass is the smallest city in Union County.

10 Largest Cities

There are 5 cities in Union County, Illinois.