The Seattle metropolitan area is located in the U.S. state of Washington and includes the three most populous counties—King, Snohomish, and Pierce—within the greater Puget Sound region. The United States Census Bureau officially defines the metropolitan area as the Seattle–Tacoma–Bellevue, WA Metropolitan Statistical Area. With an estimated population of 3,867,046 as of 2017, it is the 14th largest Metropolitan Statistical Area in the United States, with slightly more than half of Washington's population.
As defined by the United States Census Bureau, the Seattle metropolitan area is made up of the following (see Fig. STB):
Based on commuting patterns, the adjacent metropolitan areas of Olympia, Bremerton, and Mount Vernon, along with a few smaller satellite urban areas, are grouped together in a wider labor market region known as the Seattle–Tacoma–Olympia Combined Statistical Area (CSA) (See Figure STO), commonly known as the Puget Sound region. The population of this wider region is 4,686,536—roughly two-thirds of Washington's population—as of 2017. The Seattle CSA is the 12th largest CSA, and the 13th largest primary census statistical area in the country. The additional metropolitan and micropolitan areas included are:
|Seattle metropolitan area|
A map of the Seattle MSA. The Seattle MSA is highlighted in teal, the CSA in navy blue.
|Largest city||Seattle (713,700)|
|Other cities|| - Tacoma (211,277)
- Bellevue (141,400)
- Kent (127,514)
- Everett (109,043)
- Renton (100,953)
|• Total||5,872.35 sq mi (15,209.3 km2)|
|Highest elevation||14,411 ft (4,392 m)|
|Lowest elevation||0 ft (0 m)|
|• Rank||14th in the U.S.|
|• Density||659/sq mi (250/km2)|
|U.S. Decennial Census
In 2010 the median income for a household in the MSA was $63,088 and the median income for a family was $76,876. The per capita income was $32,401.
|County||2017 Estimate||2010 Census||Change||Area||Density|
|King County||2,188,649||1,931,249||+13.33%||2,115.56 sq mi (5,479.3 km2)||1,035/sq mi (399/km2)|
|Pierce County||876,764||795,225||+10.25%||1,669.51 sq mi (4,324.0 km2)||525/sq mi (203/km2)|
|Snohomish County||801,633||713,335||+12.38%||2,087.27 sq mi (5,406.0 km2)||384/sq mi (148/km2)|
|Total||3,867,046||3,439,809||+12.42%||5,872.34 sq mi (15,209.3 km2)||659/sq mi (254/km2)|
According to the Pew Research Center's 2014 U.S. Religious Landscape Study, the Seattle metropolitan area's religious affiliation is as follows: