| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gaylord | 1 | 2,368 | 2,287 | 0.64% | 1,255 | 2 | City |
| Arlington | 2 | 2,361 | 2,242 | 0.9% | 1,467 | 2 | City |
| Winthrop | 3 | 1,344 | 1,329 | 0.22% | 1,054 | 1 | City |
| Henderson | 4 | 1,004 | 957 | 0.9% | 935 | 1 | City |
| Gibbon | 5 | 796 | 784 | 0.25% | 1,199 | 1 | City |
| Green Isle | 6 | 750 | 588 | 3.73% | 733 | 1 | City |
| New Auburn | 7 | 417 | 410 | 0.24% | 611 | 1 | City |
Gaylord is the largest city in Sibley County, with a population of 2,368.
New Auburn is the smallest city in Sibley County, with a population of 417.
There are 7 cities in Sibley County, Minnesota.