Cass County, Iowa Cities (2026)

8 cities

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density
Area (mi²)
Type
Atlantic16,6846,782-0.24%8068 City
Griswold2968988-0.31%1,5891 City
Anita3949960-0.21%5352 City
Lewis43573590%7071 City
Massena5350356-0.28%5111 City
Cumberland62482480%4001 City
Marne71091080%1941 City
Wiota890920%3010 City

Cass County Cities Summary

Largest City

Atlantic is the largest city in Cass County, with a population of 6,684.

Smallest City

Wiota is the smallest city in Cass County, with a population of 90.

10 Largest Cities

There are 8 cities in Cass County, Iowa.

Location of Cass County