Union County, Illinois Cities (2026)

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density (/mi²)
Area (mi²)
Type
Anna14,0624,282-0.83%1,1004 City
Jonesboro21,6211,704-0.86%6003 City
Cobden31,0151,071-0.88%8321 Village
Dongola4633664-0.78%5821 Village
Alto Pass5297312-1%1392 Village

Union County Cities Summary

Largest City

Anna is the largest city in Union County, with a population of 4,062.

Smallest City

Alto Pass is the smallest city in Union County, with a population of 297.

10 Largest Cities

There are 5 cities in Union County, Illinois.

Location of Union County