There are 17 cities in Monona County, Iowa.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Onawa | 1 | 2,786 | 2,906 | -1.06% | 529 | 5.3 | City |
| Mapleton | 2 | 1,111 | 1,161 | -1.16% | 707 | 1.6 | City |
| Sloan | 3 | 1,061 | 1,049 | 0.28% | 1,836 | 0.6 | City |
| Dunlap | 4 | 1,033 | 1,041 | -0.19% | 828 | 1.2 | City |
| Whiting | 5 | 721 | 744 | -0.83% | 709 | 1.0 | City |
| Ute | 6 | 326 | 342 | -1.21% | 876 | 0.4 | City |
| Danbury | 7 | 308 | 318 | -0.97% | 760 | 0.4 | City |
| Hornick | 8 | 249 | 255 | -0.8% | 811 | 0.3 | City |
| Blencoe | 9 | 225 | 233 | -0.88% | 296 | 0.8 | City |
| Moorhead | 10 | 186 | 197 | -1.59% | 791 | 0.2 | City |
| Smithland | 11 | 181 | 187 | -1.09% | 564 | 0.3 | City |
| Soldier | 12 | 178 | 185 | -1.11% | 574 | 0.3 | City |
| Little Sioux | 13 | 171 | 167 | 0.59% | 456 | 0.4 | City |
| Castana | 14 | 102 | 105 | -0.97% | 112 | 0.9 | City |
| Turin | 15 | 69 | 72 | -1.43% | 767 | 0.1 | City |
| Rodney | 16 | 42 | 45 | -2.33% | 276 | 0.2 | City |
| River Sioux | 17 | 6 | 40 | 20% | 16 | 0.4 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Onawa is the largest city in Monona County.
River Sioux is the smallest city in Monona County.
There are 17 cities in Monona County, Iowa.