| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Seattle | 1 | 792,909 | 740,675 | 1.04% | 9,439 | 84 | City |
| Bellevue | 2 | 154,486 | 151,783 | 0.19% | 4,616 | 33 | City |
| Kent | 3 | 134,567 | 135,354 | -0.23% | 4,007 | 34 | City |
| Renton | 4 | 104,437 | 106,729 | -0.51% | 4,437 | 24 | City |
| Federal Way | 5 | 99,315 | 100,996 | -0.42% | 4,448 | 22 | City |
| Kirkland | 6 | 97,874 | 92,747 | 0.48% | 5,497 | 18 | City |
| Auburn | 7 | 85,735 | 88,287 | -0.66% | 2,875 | 30 | City |
| Redmond | 8 | 84,515 | 73,392 | 2.43% | 5,101 | 17 | City |
| Shoreline | 9 | 68,232 | 58,691 | 2.54% | 5,864 | 12 | City |
| Sammamish | 10 | 65,717 | 67,448 | -0.59% | 3,217 | 20 | City |
| Bothell | 11 | 53,013 | 48,174 | 1.56% | 3,888 | 14 | City |
| Burien | 12 | 51,744 | 52,000 | -0.22% | 5,154 | 10 | City |
| Issaquah | 13 | 39,227 | 40,088 | -0.5% | 3,234 | 12 | City |
| SeaTac | 14 | 35,153 | 31,394 | 1.66% | 3,493 | 10 | City |
| Des Moines | 15 | 33,036 | 32,890 | 0.01% | 5,151 | 6 | City |
| Maple Valley | 16 | 28,536 | 28,149 | 0.19% | 4,753 | 6 | City |
| Mercer Island | 17 | 25,250 | 25,744 | -0.68% | 3,956 | 6 | City |
| Kenmore | 18 | 24,260 | 23,883 | 0.05% | 3,942 | 6 | City |
| Tukwila | 19 | 21,924 | 21,746 | -0.36% | 2,387 | 9 | City |
| Covington | 20 | 21,625 | 20,860 | 0.6% | 3,645 | 6 | City |
| Woodinville | 21 | 14,633 | 13,455 | 0.58% | 2,606 | 6 | City |
| Edgewood | 22 | 13,810 | 12,421 | 1.93% | 1,647 | 8 | City |
| Snoqualmie | 23 | 13,524 | 14,074 | -0.85% | 1,884 | 7 | City |
| Enumclaw | 24 | 13,275 | 12,613 | 0.78% | 2,565 | 5 | City |
| Newcastle | 25 | 13,079 | 13,151 | -0.37% | 2,949 | 4 | City |
| Lake Forest Park | 26 | 13,076 | 13,610 | -0.87% | 3,718 | 4 | City |
| Fife | 27 | 11,059 | 10,984 | -0.02% | 1,896 | 6 | City |
| Duvall | 28 | 9,699 | 8,045 | 2.74% | 3,957 | 2 | City |
| North Bend | 29 | 9,033 | 7,502 | 3.14% | 2,078 | 4 | City |
| Black Diamond | 30 | 7,446 | 4,846 | 6.71% | 1,129 | 7 | City |
| Pacific | 31 | 7,001 | 7,236 | -0.78% | 2,893 | 2 | City |
| Normandy Park | 32 | 6,569 | 6,754 | -0.61% | 2,642 | 2 | City |
| Algona | 33 | 3,240 | 3,285 | -0.4% | 2,508 | 1 | City |
| Clyde Hill | 34 | 3,161 | 3,128 | 0% | 2,996 | 1 | City |
| Medina | 35 | 2,981 | 2,911 | 0.24% | 2,077 | 1 | City |
| Carnation | 36 | 2,495 | 2,159 | 0.97% | 2,155 | 1 | City |
| Yarrow Point | 37 | 1,141 | 1,132 | -0.17% | 3,117 | 0 | Town |
| Hunts Point | 38 | 461 | 457 | 0% | 1,502 | 0 | Town |
| Beaux Arts Village | 39 | 313 | 317 | -0.63% | 3,771 | 0 | Town |
| Skykomish | 40 | 155 | 162 | -1.27% | 494 | 0 | Town |
Seattle is the largest city in King County, with a population of 792,909.
Skykomish is the smallest city in King County, with a population of 155.
There are 40 cities in King County, Washington.