8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sac City | 1 | 1,994 | 2,056 | -0.6% | 407 | 4.90 | City |
| Lake View | 2 | 1,148 | 1,123 | 0.44% | 548 | 2.10 | City |
| Odebolt | 3 | 978 | 995 | -0.31% | 948 | 1.03 | City |
| Wall Lake | 4 | 746 | 751 | -0.13% | 652 | 1.15 | City |
| Schaller | 5 | 710 | 727 | -0.42% | 564 | 1.26 | City |
| Early | 6 | 575 | 590 | -0.52% | 1,478 | 0.39 | City |
| Auburn | 7 | 254 | 263 | -0.78% | 511 | 0.50 | City |
| Nemaha | 8 | 65 | 67 | 0% | 774 | 0.08 | City |
Sac City is the largest city in Sac County, with a population of 1,994.
Nemaha is the smallest city in Sac County.
There are 8 cities in Sac County, Iowa.