11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Portland | 1 | 615,267 | 653,344 | -1.22% | 4,609 | 133.49 | City |
| Gresham | 2 | 108,161 | 114,470 | -1.15% | 4,599 | 23.52 | City |
| Bethany | 3 | 33,567 | 28,047 | 2.63% | 6,168 | 5.44 | CDP |
| Cedar Mill | 4 | 20,302 | 18,661 | 1.93% | 6,099 | 3.33 | CDP |
| Troutdale | 5 | 15,326 | 16,303 | -1.26% | 2,578 | 5.95 | City |
| Fairview | 6 | 11,042 | 10,392 | 1.19% | 3,575 | 3.09 | City |
| Rockcreek | 7 | 10,075 | 9,698 | 0.51% | 5,125 | 1.97 | CDP |
| West Haven-Sylvan | 8 | 8,470 | 8,505 | 0.38% | 3,776 | 2.24 | CDP |
| Wood Village | 9 | 4,937 | 4,387 | 2.28% | 5,241 | 0.94 | City |
| Maywood Park | 10 | 781 | 830 | -1.26% | 4,541 | 0.17 | City |
| Fairview | 11 | 619 | 594 | 7.09% | 1,373 | 0.45 | CDP |
Portland is the largest city in Multnomah County, with a population of 615,267.
Fairview is the smallest city in Multnomah County.
There are 11 cities in Multnomah County, Oregon.