Seattle’s population rose from 608,660 in the 2010 Census to 737,015 in the 2020 Census—a gain of 128,355 people, or about 21.1%. The city’s tech economy expanded during this period, but the available population and employment figures do not establish how much tech jobs caused the increase. The latest Census Bureau QuickFacts figure cited here is a July 1, 2025 estimate of 784,777, which is an estimate rather than a new Census count.
How much did Seattle’s population grow?
The U.S. Census Bureau counted 608,660 people in Seattle city in 2010 and 737,015 in 2020. The difference is 128,355 residents; calculated against the 2010 count, that is an increase of about 21.1% over the decade. These are decennial Census counts for the city proper, not the wider Seattle metropolitan area.
| Measure | Population | What it represents |
|---|---|---|
| 2010 Census | 608,660 | Seattle city count |
| 2020 Census | 737,015 | Seattle city count |
| 2010–2020 change | 128,355, or about 21.1% | Calculated from the two Census counts |
| July 1, 2025 estimate | 784,777 | Census Bureau Vintage 2025 annual estimate; not a decennial count |
The counts and estimate are reported by the Census Bureau in QuickFacts for Seattle city, Washington. The bureau says the July 2025 estimate was 6.5% above its April 1, 2020 estimates base. That estimate-to-base comparison is a different measure from the 21.1% change between the 2010 and 2020 decennial counts.
Why Census counts and annual estimates should not be mixed
A decennial Census count and an annual population estimate are related but not interchangeable. The 2010 and 2020 figures are counts taken for those Census dates; the 2025 figure is an estimate for July 1, produced in the Census Bureau’s Vintage 2025 series. Annual estimates can be revised, so comparisons should identify the vintage rather than treating every published estimate as a fixed count.
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For example, the bureau’s Vintage 2024 release reported a July 2024 Seattle estimate of 780,995 and an increase of 16,813 from July 2023 to July 2024. Those figures belong to the Vintage 2024 series and should not be spliced into a Vintage 2025 trend without explaining the change in vintage. The Vintage 2024 release is described in the bureau’s population growth report.
What do tech jobs have to do with the increase?
Seattle’s technology economy is important context, but these sources show overlap in timing, not a measured cause of population growth. The City of Seattle Office of Economic Development, citing CompTIA’s 2021 State of Tech Workforce, reported that technology industries or occupations accounted for 13.7% of the Seattle metropolitan area workforce in 2021. The region also had about 94,300 technology job postings that year. Both figures describe the metro area, not Seattle city, and neither measures how many people moved to the city because of tech employment.
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The city’s employment analysis points to a broader expansion. Seattle’s planning document says, “Between 2010 and 2020 Seattle experienced a rapid period of job growth, as shown in Exhibit 3.8-32.” It also describes much of the net job growth as occurring in services and retail. A separate city analysis reports that Seattle’s service sector added more than 105,000 jobs over 2010–2020, with Professional, Scientific, and Technical Services and Information among the substantial service subsectors.
Together, the sources support a careful conclusion: Seattle’s population grew sharply while its tech economy and other parts of its job market expanded. They do not quantify tech’s contribution to population change or establish that tech growth was the principal driver. The city’s technology industry overview, One Seattle planning document, and Regional Centers Plan economic analysis use different employment measures and geographic contexts, so their numbers should not be treated as one city-only tech-jobs series.
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Which employment figures are city and which are regional?
Keeping geography and definitions straight prevents a metro-area technology statistic from being mistaken for a Seattle city count.
- Seattle city population: 2010 and 2020 decennial counts and the July 2025 estimate refer to Seattle city.
- Seattle metropolitan area technology workforce: the 13.7% workforce share and roughly 94,300 job postings refer to the region in 2021.
- Seattle-Tacoma-Bellevue metropolitan area occupations: the Bureau of Labor Statistics reported 174,740 jobs in computer and mathematical occupations in May 2020, equal to 8.9% of local employment, compared with a 3.3% national share. These are metro occupational figures, not a city-only tally or a count of all technology-industry jobs. See the BLS May 2020 occupational employment release.
- Seattle city employment analysis: the city’s reports discuss citywide jobs as well as downtown and regional-center activity; figures for those geographies are not interchangeable.
The 2010 Census was a population count, not a detailed survey of workers’ industries or occupations. Seattle’s Census explainer notes that the 2010 Census used a 100% short form and that social and economic characteristics are now collected through the American Community Survey. See the city’s decennial Census page.
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