The data summarized in this document is pulled directly from the Washington State Office of Financial Management (OFM). RCW 43.62.030 states that OFM shall annually determine the April 1 populations of all cities and towns of the state. OFM population estimates for cities and towns are used in state program administration and in the allocation of selected state revenues (RCW 43.62.020). Population estimates for counties are used to allocate revenues as specified in RCW 36.13.100 and RCW 43.62.030. The dataset used in the following summary can be downloaded here.



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Regional Population

The population of the PSRC region totaled more than 3690942 people in 2010. By 2020, the total population of the region had grown to more than 4264200 people, an increase of 573,260 people over 10 years. More than 56% of the State of Washington called the Puget Sound Region home in 2020.

Incorporated Area Population

In 2010, approximately 68% of the regional population lived in our region’s vibrant cities and towns. By 2020 the share of population in cities and towns had grown to 71%, accounting for more than 3,040,400 people living in the region’s incorporated places.

Cities by Size in 2020

There are 82 cities and towns in the PSRC region. The largest city in 2020 was Seattle with a population of approximately 761,100 people. The smallest place in the region in 2020 was the Town of Index with around 180 people.

County Population

There are 4 counties that make up the Puget Sound Region and they are King, Kitsap, Pierce, Snohomish counties. The population distribution of the 4 counties are shown below:

King County

King County was home to 1,931,200 people in 2010. By 2020, the total population of the county had grown to more than 2,260,800 people, an increase of 329,550 people over 10 years.

King County Total Population

This is the total population of the county.

King County Incorporated Area Population

This is a stacked bar by incorporation status

Population of Cities and Towns in King County: 2020

This is a plot of population for every city in the county

Kitsap County

Kitsap County was home to 251,100 people in 2010. By 2020, the total population of the county had grown to more than 272,200 people, an increase of 21,070 people over 10 years.

Kitsap County Total Population

This is the total population of the county.

Kitsap County Incorporated Area Population

This is a stacked bar by incorporation status

Population of Cities and Towns in Kitsap County: 2020

This is a plot of population for every city in the county

Pierce County

Pierce County was home to 795,200 people in 2010. By 2020, the total population of the county had grown to more than 900,700 people, an increase of 105,480 people over 10 years.

Pierce County Total Population

This is the total population of the county.

Pierce County Incorporated Area Population

This is a stacked bar by incorporation status

Population of Cities and Towns in Pierce County: 2020

This is a plot of population for every city in the county

Snohomish County

Snohomish County was home to 713,300 people in 2010. By 2020, the total population of the county had grown to more than 830,500 people, an increase of 117,160 people over 10 years.

Snohomish County Total Population

This is the total population of the county.

Snohomish County Incorporated Area Population

This is a stacked bar by incorporation status

Population of Cities and Towns in Snohomish County: 2020

This is a plot of population for every city in the county

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