26 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Tillamook | 1 | 5,141 | 5,206 | -0.31% | 2,700 | 2 | City |
| Tillamook | 2 | 5,141 | 5,220 | -0.31% | 2,700 | 2 | City |
| Pacific City | 3 | 1,950 | 1,234 | 3.23% | 524 | 4 | CDP |
| Rockaway Beach | 4 | 1,438 | 1,447 | -0.21% | 899 | 2 | City |
| Rockaway Beach | 5 | 1,438 | 1,451 | -0.21% | 899 | 2 | City |
| Bay City | 6 | 1,379 | 1,384 | -0.14% | 1,077 | 1 | City |
| Bay City | 7 | 1,379 | 1,389 | -0.14% | 1,077 | 1 | City |
| Bayside Gardens | 8 | 1,005 | 1,104 | 0.8% | 1,014 | 1 | CDP |
| Garibaldi | 9 | 815 | 823 | -0.24% | 827 | 1 | City |
| Garibaldi | 10 | 815 | 825 | -0.24% | 827 | 1 | City |
| Manzanita | 11 | 646 | 606 | 1.1% | 787 | 1 | City |
| Manzanita | 12 | 646 | 608 | 1.1% | 787 | 1 | City |
| Pleasant Valley | 13 | 636 | 504 | 7.07% | 217 | 3 | CDP |
| Netarts | 14 | 590 | 743 | -1.83% | 227 | 3 | CDP |
| Oceanside | 15 | 500 | 465 | 2.04% | 482 | 1 | CDP |
| Wheeler | 16 | 423 | 427 | -0.24% | 810 | 1 | City |
| Wheeler | 17 | 423 | 427 | -0.24% | 810 | 1 | City |
| Neahkahnie | 18 | 378 | 271 | 7.39% | 579 | 1 | CDP |
| Nehalem | 19 | 270 | 274 | -0.37% | 1,007 | 0 | City |
| Nehalem | 20 | 270 | 274 | -0.37% | 1,007 | 0 | City |
| Cape Meares | 21 | 249 | 93 | 7.33% | 72 | 3 | CDP |
| Hebo | 22 | 243 | 130 | 0.41% | 149 | 2 | CDP |
| Beaver | 23 | 227 | 121 | 3.18% | 588 | 0 | CDP |
| Neskowin | 24 | 188 | 79 | 2.17% | 135 | 1 | CDP |
| Cloverdale | 25 | 147 | 146 | -4.55% | 183 | 1 | CDP |
| Idaville | 26 | 125 | 292 | -10.07% | 256 | 0 | CDP |
Tillamook is the largest city in Tillamook County, with a population of 5,141.
Idaville is the smallest city in Tillamook County, with a population of 125.
There are 26 cities in Tillamook County, Oregon.