8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sac City | 1 | 1,976 | 2,056 | -0.8% | 404 | 5 | City |
| Lake View | 2 | 1,119 | 1,121 | -0.09% | 534 | 2 | City |
| Odebolt | 3 | 960 | 995 | -0.72% | 930 | 1 | City |
| Wall Lake | 4 | 735 | 755 | -0.54% | 642 | 1 | City |
| Schaller | 5 | 696 | 726 | -0.85% | 553 | 1 | City |
| Early | 6 | 566 | 589 | -0.88% | 1,455 | 0 | City |
| Auburn | 7 | 250 | 262 | -1.19% | 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 1,976.
Nemaha is the smallest city in Sac County, with a population of 64.
There are 8 cities in Sac County, Iowa.