Union County, Illinois Cities (2026)

5 cities

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density
Area (mi²)
Type
Anna14,1064,282-0.7%1,1124 City
Jonesboro21,6301,704-0.73%6043 City
Cobden31,0241,072-0.78%8391 Village
Dongola4637661-0.62%5851 Village
Alto Pass5301312-0.66%1412 Village

Union County Cities Summary

Largest City

Anna is the largest city in Union County, with a population of 4,106.

Smallest City

Alto Pass is the smallest city in Union County, with a population of 301.

10 Largest Cities

There are 5 cities in Union County, Illinois.

Location of Union County