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 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Williamsburg | 1 | 3,349 | 3,355 | -0.06% | 994 | 3.4 | City |
| Marengo | 2 | 2,392 | 2,438 | -0.5% | 1,131 | 2.1 | City |
| North English | 3 | 1,024 | 1,066 | -1.06% | 1,687 | 0.6 | City |
| Victor | 4 | 845 | 873 | -0.82% | 1,757 | 0.5 | City |
| Middle Amana | 5 | 578 | 783 | 0% | 595 | 1.0 | CDP |
| Amana | 6 | 575 | 472 | 1.59% | 580 | 1.0 | CDP |
| Ladora | 7 | 222 | 229 | -0.89% | 753 | 0.3 | City |
| Parnell | 8 | 187 | 193 | -1.06% | 1,056 | 0.2 | City |
| South Amana | 9 | 150 | 111 | 0% | 108 | 1.4 | CDP |
| Millersburg | 10 | 137 | 136 | 0% | 1,123 | 0.1 | City |
| Homestead | 11 | 122 | 62 | -1.61% | 94 | 1.3 | CDP |
| Conroy | 12 | 96 | 221 | -10.28% | 126 | 0.8 | CDP |
| High Amana | 13 | 88 | 73 | -2.22% | 230 | 0.4 | CDP |
| West Amana | 14 | 64 | 122 | -7.25% | 235 | 0.3 | CDP |
| East Amana | 15 | 41 | 38 | 7.9% | 110 | 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.
Williamsburg is the largest city in Iowa County.
East Amana is the smallest city in Iowa County.
There are 15 cities in Iowa County, Iowa.