19 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Everett | 1 | 114,070 | 110,892 | 0.47% | 3,395 | 34 | City |
| Marysville | 2 | 78,824 | 70,979 | 1.69% | 3,798 | 21 | City |
| Lynnwood | 3 | 43,121 | 38,549 | 1.8% | 5,474 | 8 | City |
| Edmonds | 4 | 42,889 | 42,835 | 0.02% | 4,810 | 9 | City |
| Lake Stevens | 5 | 42,469 | 39,112 | 1.34% | 4,180 | 10 | City |
| Mountlake Terrace | 6 | 27,154 | 21,286 | 3.74% | 6,695 | 4 | City |
| Arlington | 7 | 22,916 | 20,045 | 2.13% | 2,298 | 10 | City |
| Mukilteo | 8 | 21,194 | 21,508 | -0.24% | 3,392 | 6 | City |
| Mill Creek | 9 | 21,033 | 20,912 | 0.1% | 4,529 | 5 | City |
| Monroe | 10 | 19,878 | 20,024 | -0.12% | 3,118 | 6 | City |
| Snohomish | 11 | 10,714 | 10,173 | 0.85% | 3,043 | 4 | City |
| Stanwood | 12 | 9,515 | 7,798 | 3.1% | 3,196 | 3 | City |
| Sultan | 13 | 7,919 | 5,168 | 6.15% | 2,372 | 3 | City |
| Brier | 14 | 6,627 | 6,554 | 0.18% | 3,018 | 2 | City |
| Granite Falls | 15 | 4,751 | 4,603 | 0.53% | 2,167 | 2 | City |
| Gold Bar | 16 | 2,512 | 2,410 | 0.68% | 2,372 | 1 | City |
| Darrington | 17 | 1,511 | 1,478 | 0.4% | 794 | 2 | Town |
| Woodway | 18 | 1,326 | 1,316 | 0.15% | 1,135 | 1 | City |
| Index | 19 | 163 | 154 | 1.24% | 709 | 0 | Town |
Everett is the largest city in Snohomish County, with a population of 114,070.
Index is the smallest city in Snohomish County, with a population of 163.
There are 19 cities in Snohomish County, Washington.