How much has your city grown?

New Trend features population change from 2010 to 2020

The central Puget Sound region grew by 600,000 over the last decade, adding the equivalent of two Kitsap counties since the 2010 Census. And since 2000, the region added the equivalent of another Seattle and Tacoma in terms of new residents.

Of the nearly one million new people added to the state’s population during the last decade, 62% were residents of King, Kitsap, Pierce and Snohomish counties.

Download the full Trend to see the data for all 82 cities and towns in the region.

Kirkland saw the most population growth by rate, though much of that growth was due to annexation. In 2011, the city saw an increase of 32,000, nearly doubling its size. Kent was one of the fastest-growing cities in the country, adding 25,000 people in the Panther Lake area early in the decade.

Seattle saw the largest population gain in the region in terms of raw numbers, with an increase of 128,000 residents. King County was one of only five counties in the U.S. to gain more than 300,000 people since 2010.

The results of the Census are not only used to determine each state’s representation in Congress, but are also used to allocate hundreds of billions of federal and state dollars to communities across the country. These funds are used for infrastructure projects, economic development, education, healthcare, investments and other public works projects. Businesses also use Census data to make decisions about where to expand their operations and start new ones, open new restaurants and factories, and recruit employees.

This data comes from the most recent edition of Puget Sound Trends, which are data stories about population, transportation and other economic trends in the region. The full Trend is available on our website, which shows how our 82 cities and towns have developed since 2010.

As a regional affiliate of the Washington State Data Center, PSRC maintains data released from past censuses as well as the American Community Survey for the central Puget Sound region on behalf of the public. PSRC also works with the U.S. Census Bureau and state and local agencies on census-related issues around the region.