40 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Seattle | 1 | 801,192 | 740,600 | 1.28% | 9,538 | 84 | City |
| Bellevue | 2 | 155,672 | 151,786 | 0.42% | 4,651 | 33 | City |
| Kent | 3 | 136,585 | 136,593 | 0% | 4,067 | 34 | City |
| Renton | 4 | 104,947 | 106,734 | -0.28% | 4,458 | 24 | City |
| Federal Way | 5 | 99,881 | 100,994 | -0.18% | 4,473 | 22 | City |
| Kirkland | 6 | 96,878 | 92,741 | 0.72% | 5,441 | 18 | City |
| Redmond | 7 | 86,605 | 73,374 | 2.61% | 5,228 | 17 | City |
| Auburn | 8 | 84,747 | 87,045 | -0.45% | 2,842 | 30 | City |
| Shoreline | 9 | 69,966 | 58,820 | 2.73% | 6,013 | 12 | City |
| Sammamish | 10 | 65,986 | 67,449 | -0.37% | 3,230 | 20 | City |
| Bothell | 11 | 53,568 | 48,174 | 1.71% | 3,929 | 14 | City |
| Burien | 12 | 52,071 | 51,996 | 0.02% | 5,187 | 10 | City |
| Issaquah | 13 | 39,444 | 40,103 | -0.28% | 3,252 | 12 | City |
| SeaTac | 14 | 35,342 | 31,387 | 1.9% | 3,512 | 10 | City |
| Des Moines | 15 | 33,366 | 32,889 | 0.24% | 5,202 | 6 | City |
| Maple Valley | 16 | 28,786 | 28,086 | 0.41% | 4,794 | 6 | City |
| Mercer Island | 17 | 25,078 | 25,750 | -0.44% | 3,929 | 6 | City |
| Kenmore | 18 | 24,302 | 23,894 | 0.28% | 3,949 | 6 | City |
| Covington | 19 | 21,919 | 20,862 | 0.81% | 3,695 | 6 | City |
| Tukwila | 20 | 21,580 | 21,748 | -0.13% | 2,349 | 9 | City |
| Woodinville | 21 | 14,175 | 13,475 | 0.83% | 2,524 | 6 | City |
| Edgewood | 22 | 14,033 | 12,422 | 1.95% | 1,674 | 8 | City |
| Snoqualmie | 23 | 13,580 | 14,084 | -0.61% | 1,892 | 7 | City |
| Enumclaw | 24 | 13,449 | 12,620 | 1.04% | 2,598 | 5 | City |
| Lake Forest Park | 25 | 13,112 | 13,604 | -0.62% | 3,728 | 4 | City |
| Newcastle | 26 | 13,035 | 13,145 | -0.14% | 2,939 | 4 | City |
| Fife | 27 | 11,083 | 11,064 | 0.03% | 1,900 | 6 | City |
| Duvall | 28 | 9,741 | 8,046 | 2.99% | 3,974 | 2 | City |
| North Bend | 29 | 9,078 | 7,502 | 2.98% | 2,088 | 4 | City |
| Black Diamond | 30 | 7,757 | 4,846 | 6.67% | 1,176 | 7 | City |
| Pacific | 31 | 7,008 | 7,238 | -0.54% | 2,896 | 2 | City |
| Normandy Park | 32 | 6,613 | 6,757 | -0.36% | 2,660 | 2 | City |
| Algona | 33 | 3,260 | 3,286 | -0.12% | 2,523 | 1 | City |
| Clyde Hill | 34 | 3,173 | 3,127 | 0.25% | 3,008 | 1 | City |
| Medina | 35 | 3,004 | 2,919 | 0.47% | 2,093 | 1 | City |
| Carnation | 36 | 2,338 | 2,161 | 1.3% | 2,019 | 1 | City |
| Yarrow Point | 37 | 1,135 | 1,132 | 0.09% | 3,101 | 0 | Town |
| Hunts Point | 38 | 462 | 455 | 0.22% | 1,505 | 0 | Town |
| Beaux Arts Village | 39 | 311 | 316 | -0.32% | 3,747 | 0 | Town |
| Skykomish | 40 | 156 | 162 | -0.64% | 497 | 0 | Town |
Seattle is the largest city in King County, with a population of 801,192.
Skykomish is the smallest city in King County, with a population of 156.
There are 40 cities in King County, Washington.