| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sac City | 1 | 1,981 | 2,057 | -0.6% | 405 | 5 | City |
| Lake View | 2 | 1,124 | 1,119 | 0.18% | 537 | 2 | City |
| Odebolt | 3 | 962 | 993 | -0.52% | 932 | 1 | City |
| Wall Lake | 4 | 733 | 754 | -0.41% | 640 | 1 | City |
| Schaller | 5 | 696 | 727 | -0.71% | 553 | 1 | City |
| Early | 6 | 563 | 588 | -0.71% | 1,447 | 0 | City |
| Auburn | 7 | 250 | 261 | -0.79% | 503 | 0 | City |
| Nemaha | 8 | 64 | 67 | -1.54% | 762 | 0 | City |
Sac City is the largest city in Sac County, with a population of 1,981.
Nemaha is the smallest city in Sac County, with a population of 64.
There are 8 cities in Sac County, Iowa.