| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Tillamook | 1 | 5,153 | 5,210 | -0.17% | 2,706 | 2 | City |
| Rockaway Beach | 2 | 1,455 | 1,456 | 0% | 909 | 2 | City |
| Bay City | 3 | 1,388 | 1,387 | 0% | 1,086 | 1 | City |
| Garibaldi | 4 | 815 | 821 | -0.12% | 827 | 1 | City |
| Manzanita | 5 | 657 | 608 | 1.39% | 800 | 1 | City |
| Wheeler | 6 | 425 | 430 | -0.23% | 814 | 1 | City |
| Nehalem | 7 | 271 | 274 | -0.37% | 1,011 | 0 | City |
Tillamook is the largest city in Tillamook County, with a population of 5,153.
Nehalem is the smallest city in Tillamook County, with a population of 271.
There are 7 cities in Tillamook County, Oregon.