13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Algona | 1 | 5,251 | 5,478 | -0.85% | 1,134 | 4.63 | City |
| Bancroft | 2 | 667 | 699 | -0.89% | 1,181 | 0.56 | City |
| Swea City | 3 | 535 | 565 | -1.11% | 698 | 0.77 | City |
| Titonka | 4 | 475 | 505 | -1.25% | 1,684 | 0.28 | City |
| Whittemore | 5 | 467 | 496 | -1.27% | 1,150 | 0.41 | City |
| Burt | 6 | 397 | 417 | -1% | 934 | 0.42 | City |
| Wesley | 7 | 372 | 392 | -1.06% | 559 | 0.67 | City |
| Lakota | 8 | 257 | 267 | -0.77% | 353 | 0.73 | City |
| Lu Verne | 9 | 244 | 254 | -0.81% | 115 | 2.12 | City |
| Fenton | 10 | 243 | 267 | -2.02% | 736 | 0.33 | City |
| Lone Rock | 11 | 140 | 147 | -0.71% | 1,207 | 0.12 | City |
| Ledyard | 12 | 117 | 122 | -0.85% | 225 | 0.52 | City |
| St. Benedict | 13 | 55 | 24 | 7.84% | 72 | 0.77 | CDP |
Algona is the largest city in Kossuth County, with a population of 5,251.
St. Benedict is the smallest city in Kossuth County.
There are 13 cities in Kossuth County, Iowa.