Seattle-Tacoma, WA Combined Statistical Area Demographics
Seattle-Tacoma, WA Combined Statistical Area is the 13th most populous of 184 combined statistical areas in the United States, with 4,953,221 residents across 12,289 square miles. That is about 403 people per square mile.
At the 2020 census
| Population | 4,953,221 |
|---|---|
| Land area | 12,289 sq mi |
| Density | 403 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Seattle-Tacoma, WA Combined Statistical Area compares to the US
We're computing this combined statistical area's comparison table — check back shortly. Population, land area, and density above are already exact.
Central Location: Seattle-Tacoma, WA Combined Statistical Area
Measured from the combined statistical area's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Seattle-Tacoma, WA Combined Statistical Area — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Counties in the Seattle-Tacoma, WA Combined Statistical Area area
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| King County, WA | 2,269,568 | 2,115.6 | 1,073 |
| Pierce County | 921,090 | 1,668.0 | 552 |
| Snohomish County | 827,945 | 2,086.5 | 397 |
| County Thurston | 294,793 | 722.0 | 408 |
| County Kitsap | 275,610 | 394.9 | 698 |
| County Skagit | 129,488 | 1,731.2 | 75 |
| Island County | 86,857 | 208.5 | 417 |
| County Lewis | 82,149 | 2,402.8 | 34 |
| County Mason | 65,721 | 959.4 | 69 |
Related places
Nearest combined statistical areas
- Portland-Vancouver-Salem, OR-WA Combined Statistical Area
- Moses Lake-Othello, WA Combined Statistical Area
- Kennewick-Richland-Walla Walla, WA Combined Statistical Area
- Spokane-Spokane Valley-Coeur d'Alene, WA-ID Combined Statistical Area
- Pullman-Moscow, WA-ID Combined Statistical Area
- Medford-Grants Pass, OR Combined Statistical Area
About this page
This page shows demographics for a US combined statistical area from the 2020 census and the American Community Survey: population, land area, density, and how the region compares to national averages.
Combined areas are built from whole counties, listed below. Statistics aggregate the member counties' census tracts.