13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Algona | 1 | 5,307 | 5,474 | -0.64% | 1,146 | 5 | City |
| Bancroft | 2 | 672 | 696 | -0.74% | 1,189 | 1 | City |
| Swea City | 3 | 540 | 564 | -0.92% | 704 | 1 | City |
| Titonka | 4 | 487 | 507 | -0.81% | 1,727 | 0 | City |
| Whittemore | 5 | 474 | 494 | -0.84% | 1,167 | 0 | City |
| Burt | 6 | 400 | 417 | -0.99% | 941 | 0 | City |
| Wesley | 7 | 379 | 393 | -0.79% | 569 | 1 | City |
| Lakota | 8 | 259 | 267 | -0.77% | 355 | 1 | City |
| Fenton | 9 | 246 | 265 | -1.6% | 745 | 0 | City |
| Lu Verne | 10 | 246 | 254 | -0.81% | 116 | 2 | City |
| Lone Rock | 11 | 142 | 147 | -0.7% | 1,224 | 0 | City |
| Ledyard | 12 | 116 | 123 | -1.69% | 223 | 1 | City |
| St. Benedict | 13 | 55 | 24 | 7.84% | 72 | 1 | CDP |
Algona is the largest city in Kossuth County, with a population of 5,307.
St. Benedict is the smallest city in Kossuth County, with a population of 55.
There are 13 cities in Kossuth County, Iowa.