24 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gaylord | 1 | 2,356 | 2,281 | 0.64% | 1,249 | 1.89 | City |
| Arlington | 2 | 2,347 | 2,242 | 0.9% | 1,459 | 1.61 | City |
| Winthrop | 3 | 1,328 | 1,327 | 0% | 1,042 | 1.27 | City |
| Henderson | 4 | 989 | 953 | 0.71% | 921 | 1.07 | City |
| Gibbon | 5 | 788 | 785 | 0.13% | 1,187 | 0.66 | City |
| Faxon township | 6 | 729 | 710 | 0.69% | 35 | 20.92 | Township |
| Green Isle | 7 | 713 | 588 | 3.63% | 702 | 1.01 | City |
| Henderson township | 8 | 688 | 664 | 1.18% | 23 | 29.89 | Township |
| Green Isle township | 9 | 542 | 520 | 1.31% | 15 | 35.19 | Township |
| Arlington township | 10 | 487 | 468 | 1.25% | 14 | 34.48 | Township |
| Washington Lake township | 11 | 464 | 451 | 0.87% | 14 | 34.29 | Township |
| Jessenland township | 12 | 446 | 427 | 1.36% | 13 | 33.26 | Township |
| New Auburn | 13 | 409 | 409 | 0% | 600 | 0.68 | City |
| New Auburn township | 14 | 396 | 386 | 0.76% | 12 | 32.11 | Township |
| Bismarck township | 15 | 338 | 324 | 1.5% | 9 | 35.95 | Township |
| Dryden township | 16 | 311 | 301 | 0.97% | 10 | 32.61 | Township |
| Alfsborg township | 17 | 288 | 281 | 0.7% | 8 | 34.98 | Township |
| Kelso township | 18 | 283 | 269 | 1.8% | 8 | 35.62 | Township |
| Moltke township | 19 | 275 | 267 | 0.73% | 7 | 39.04 | Township |
| Transit township | 20 | 262 | 251 | 1.55% | 7 | 35.01 | Township |
| Cornish township | 21 | 251 | 237 | 2.03% | 7 | 35.44 | Township |
| Sibley township | 22 | 243 | 232 | 1.67% | 7 | 35.55 | Township |
| Severance township | 23 | 227 | 216 | 1.79% | 6 | 36.85 | Township |
| Grafton township | 24 | 213 | 204 | 1.43% | 5 | 38.91 | Township |
Gaylord is the largest city in Sibley County, with a population of 2,356.
Grafton township is the smallest city in Sibley County.
There are 24 cities in Sibley County, Minnesota.