| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Everett | 1 | 113,956 | 110,792 | 0.34% | 3,391 | 34 | City |
| Marysville | 2 | 78,929 | 70,974 | 1.6% | 3,803 | 21 | City |
| Lynnwood | 3 | 42,857 | 38,546 | 1.72% | 5,441 | 8 | City |
| Edmonds | 4 | 42,721 | 42,829 | -0.06% | 4,791 | 9 | City |
| Lake Stevens | 5 | 42,620 | 39,092 | 1.26% | 4,194 | 10 | City |
| Mountlake Terrace | 6 | 26,380 | 21,284 | 3.74% | 6,504 | 4 | City |
| Arlington | 7 | 22,490 | 20,055 | 2.08% | 2,256 | 10 | City |
| Mukilteo | 8 | 21,172 | 21,510 | -0.32% | 3,388 | 6 | City |
| Mill Creek | 9 | 20,907 | 20,909 | 0.02% | 4,502 | 5 | City |
| Monroe | 10 | 19,987 | 20,025 | -0.19% | 3,135 | 6 | City |
| Snohomish | 11 | 10,798 | 10,174 | 0.74% | 3,067 | 4 | City |
| Stanwood | 12 | 9,699 | 7,797 | 2.95% | 3,258 | 3 | City |
| Sultan | 13 | 7,680 | 5,170 | 6.22% | 2,301 | 3 | City |
| Brier | 14 | 6,603 | 6,546 | 0.09% | 3,007 | 2 | City |
| Granite Falls | 15 | 4,707 | 4,603 | 0.45% | 2,147 | 2 | City |
| Gold Bar | 16 | 2,575 | 2,403 | 0.55% | 2,432 | 1 | City |
| Darrington | 17 | 1,504 | 1,482 | 0.27% | 790 | 2 | Town |
| Woodway | 18 | 1,317 | 1,310 | 0.08% | 1,128 | 1 | City |
| Index | 19 | 166 | 155 | 0.61% | 722 | 0 | Town |
Everett is the largest city in Snohomish County, with a population of 113,956.
Index is the smallest city in Snohomish County, with a population of 166.
There are 19 cities in Snohomish County, Washington.