8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sac City | 1 | 1,960 | 2,056 | -0.81% | 400 | 5 | City |
| Lake View | 2 | 1,119 | 1,121 | 0% | 534 | 2 | City |
| Odebolt | 3 | 953 | 995 | -0.73% | 923 | 1 | City |
| Wall Lake | 4 | 731 | 755 | -0.54% | 638 | 1 | City |
| Schaller | 5 | 690 | 726 | -0.86% | 548 | 1 | City |
| Early | 6 | 562 | 589 | -0.71% | 1,445 | 0 | City |
| Auburn | 7 | 248 | 262 | -0.8% | 499 | 0 | City |
| Nemaha | 8 | 64 | 67 | 0% | 762 | 0 | City |
Sac City is the largest city in Sac County, with a population of 1,960.
Nemaha is the smallest city in Sac County, with a population of 64.
There are 8 cities in Sac County, Iowa.