Johnson County, Illinois Cities (2026)

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density (/mi²)
Area (mi²)
Type
Vienna11,3511,354-0.07%4763 City
Goreville21,0531,062-0.19%3923 Village
Cypress32172170%2881 Village
Buncombe42072050%1741 Village
New Burnside51531530%1461 Village
Belknap686860%811 Village
Simpson745450%861 Village

Johnson County Cities Summary

Largest City

Vienna is the largest city in Johnson County, with a population of 1,351.

Smallest City

Simpson is the smallest city in Johnson County, with a population of 45.

10 Largest Cities

There are 7 cities in Johnson County, Illinois.

Location of Johnson County