12 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Algona | 1 | 5,274 | 5,474 | -0.62% | 1,139 | 5 | City |
| Bancroft | 2 | 667 | 696 | -0.74% | 1,181 | 1 | City |
| Swea City | 3 | 535 | 564 | -0.93% | 698 | 1 | City |
| Titonka | 4 | 483 | 507 | -0.82% | 1,713 | 0 | City |
| Whittemore | 5 | 470 | 494 | -0.84% | 1,158 | 0 | City |
| Burt | 6 | 397 | 417 | -0.75% | 934 | 0 | City |
| Wesley | 7 | 376 | 393 | -0.79% | 565 | 1 | City |
| Lakota | 8 | 258 | 267 | -0.39% | 354 | 1 | City |
| Lu Verne | 9 | 245 | 254 | -0.41% | 115 | 2 | City |
| Fenton | 10 | 242 | 265 | -1.63% | 733 | 0 | City |
| Lone Rock | 11 | 141 | 147 | -0.7% | 1,216 | 0 | City |
| Ledyard | 12 | 115 | 123 | -0.86% | 221 | 1 | City |
Algona is the largest city in Kossuth County, with a population of 5,274.
Ledyard is the smallest city in Kossuth County, with a population of 115.
There are 12 cities in Kossuth County, Iowa.