City · Washington
SeaTac, Washington
SeaTac, city, in King County, Washington. SeaTac had 34,578 residents on July 1, 2025 by the Census Bureau's estimate, up 10.0% since 2020; the 2020 Census counted 31,454 and the ACS 2020-2024 5-year estimates put it at 32,414 (±74). GEOID 5362288.
Residents, July 2025 estimate
34,578
Census Bureau estimate (no margin published)
2020 Census count: 31,454 · ACS 2020-2024: 32,414 ±74
Median household income
$81,104
±$9,991 (90% margin)
Washington: $98,141
Median home value
$519,700
±$35,724 (90% margin)
Washington: $564,600
Median gross rent
$1,660
±$70 (90% margin)
Washington: $1,760
Where is SeaTac and what county is it in?
SeaTac is a city in King County, Washington. It covers 10.1 square miles of land, 3,125 residents per square mile in 2020.
SeaTac is in the Seattle-Tacoma-Bellevue, WA metropolitan statistical area, which takes in 3 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in SeaTac, and is it growing?
The Census Bureau estimates that 34,578 people lived in SeaTac on July 1, 2025, up 10.0% since 2020, faster than Washington (+3.8%). The 2020 Census counted 31,454 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 32,414 (±74).
| Measure | SeaTac | King County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 32,414 ±74 | 2,287,171 | +3,395 |
| Households | 12,134 ±731 | 941,054 | +2,387 |
| Average household size | 2.60 ±0.15 | 2.39 | −0.27 |
| Housing units | 12,886 ±733 | 1,003,284 | +2,424 |
SeaTac's population since 2000
From 25,496 in 2000 to 34,578 in 2025: up 35.6%. The 2000, 2010 and 2020 figures are census counts, each for SeaTac as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in SeaTac?
The median resident of SeaTac is 36.8 years old; 22.5% are under 18 and 12.8% are 65 or older. The largest group is non-Hispanic white residents at 27.0%, then non-Hispanic Black residents at 24.4%. 39.9% of residents were born outside the United States.
| Measure | SeaTac | King County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 36.8 ±2.2 | 37.4 | no clear change |
| Under 18 years | 22.5% ±2.8 pts | 19.5% | – |
| 65 years and over | 12.8% ±2.0 pts | 14.0% | – |
| Male | 55.2% ±2.4 pts | 50.7% | – |
| Hispanic or Latino (any race) | 22.8% ±4.6 pts | 11.0% | +5.5 pts |
| White alone, not Hispanic | 27.0% ±3.1 pts | 52.9% | −5.1 pts |
| Black or African American alone, not Hispanic | 24.4% ±3.5 pts | 6.4% | no clear change |
| Asian alone, not Hispanic | 17.4% ±2.8 pts | 20.5% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.3% ±0.1 pts | 0.4% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 1.3% ±0.7 pts | 0.7% | – |
| Two or more races, not Hispanic | 6.7% ±2.1 pts | 7.3% | – |
| Some other race alone, not Hispanic | 0.2% ±0.3 pts | 0.6% | – |
| Born outside the United States | 39.9% ±3.4 pts | 25.8% | no clear change |
| Speak a language other than English at home (age 5+) | 50.5% ±4.3 pts | 31.1% | – |
| Civilian veterans (age 18+) | 4.9% ±1.4 pts | 4.5% | – |
| With a disability | 13.4% ±1.9 pts | 10.3% | – |
| No health insurance coverage | 11.6% ±2.9 pts | 5.2% | +3.5 pts |
| High school graduate or higher (age 25+) | 83.9% ±3.2 pts | 93.8% | – |
| Bachelor's degree or higher (age 25+) | 26.4% ±3.0 pts | 56.7% | no clear change |
| Graduate or professional degree (age 25+) | 6.7% ±1.7 pts | 24.2% | – |
| Lived in the same house a year earlier | 80.5% ±4.5 pts | 83.3% | – |
| Moved from another state in the past year | 1.6% ±1.4 pts | 3.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in SeaTac earn?
Half of SeaTac's 12,134 households earn less than $81,104 a year (±$9,991), against $124,746 in King County and $98,141 in Washington. In 2015-2019 it was $77,545 in 2024 dollars; the margins of error cannot tell the two periods apart. 9.3% of residents live below the poverty line.
| Measure | SeaTac | King County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $81,104 ±$9,991 | $124,746 | no clear change |
| Mean household income | $98,134 ±$6,054 | $176,799 | – |
| Per capita income | $38,330 ±$2,636 | $74,100 | +$4,296 |
| People below the poverty line | 9.3% ±2.7 pts | 8.6% | no clear change |
| Children under 18 below the poverty line | 8.8% ±5.4 pts | 9.7% | −10.4 pts |
| Households receiving SNAP | 14.8% ±2.8 pts | 8.2% | – |
| Households with a computer | 97.3% ±2.1 pts | 98.1% | – |
| Households with a broadband subscription | 91.9% ±3.6 pts | 95.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in SeaTac?
Owners occupy 46.5% of SeaTac's occupied homes and renters 53.5%. The median owner-occupied home is valued at $519,700 by its owner (±$35,724). The median renter pays $1,660 a month including utilities, and 48.5% of renters pay 35% or more of their income on rent.
| Measure | SeaTac | King County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $519,700 ±$35,724 | $859,900 | +$124,278 |
| Median gross rent | $1,660 ±$70 | $2,092 | no clear change |
| Renters paying 35% or more of income on rent | 48.5% ±7.0 pts | 37.5% | no clear change |
| Median monthly owner costs, with a mortgage | $2,304 ±$99 | $3,273 | – |
| Owner-occupied homes | 46.5% ±4.7 pts | 55.4% | no clear change |
| Renter-occupied homes | 53.5% ±4.7 pts | 44.6% | – |
| Housing units | 12,886 ±733 | 1,003,284 | +2,424 |
| Homeowner vacancy rate | 0.0% ±0.7 pts | 0.7% | – |
| Rental vacancy rate | 4.4% ±2.5 pts | 5.3% | – |
| Single-family detached homes | 42.3% ±4.3 pts | 50.0% | – |
| Mobile homes | 4.6% ±2.3 pts | 1.4% | – |
| Built 2020 or later | 2.5% ±1.2 pts | 2.1% | – |
| Built 2010 to 2019 | 8.9% ±2.1 pts | 14.2% | – |
| Built 1939 or earlier | 4.6% ±2.4 pts | 10.9% | – |
| Households with no vehicle | 10.6% ±3.2 pts | 11.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is SeaTac building?
Builders took permits for 13 new housing units in SeaTac in 2025 (9 in single-family houses), 0.4 per 1,000 residents against 4.4 across Washington.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in SeaTac work and get to work?
58.5% of SeaTac's workers drive alone and 11.5% work from home. The average trip to work takes 25.4 minutes. The unemployment rate in 2020-2024 averaged 7.0%.
| Measure | SeaTac | King County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 69.1% ±2.5 pts | 69.9% | – |
| Unemployment rate | 7.0% ±2.1 pts | 4.8% | no clear change |
| Drove alone to work | 58.5% ±5.0 pts | 50.4% | – |
| Carpooled | 16.6% ±4.3 pts | 7.0% | – |
| Public transportation | 6.5% ±2.3 pts | 6.8% | – |
| Walked | 5.2% ±2.2 pts | 4.3% | – |
| Worked from home | 11.5% ±2.7 pts | 29.2% | +9.2 pts |
| Mean travel time to work | 25.4 min ±1.5 | 27.6 min | −2.5 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in SeaTac?
6 census tracts lie mostly in SeaTac, and 7 more reach into it (2020 census blocks). Their median household incomes run from $59,208 (Tract 288.02) to $110,147 (Tract 273).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 288.02King County | 7,389 | $59,208 |
| Tract 284.03King County | 6,222 | $61,188 |
| Tract 284.02King County | 6,158 | $82,256 |
| Tract 273King County | 7,194 | $110,147 |
| Tract 281King County | 3,043 | $68,284 |
| Tract 288.01King County | 3,477 | $71,682 |
| Tract 283King County | 5,902 | $115,700 |
| Tract 285King County | 4,309 | $98,478 |
| Tract 291.01King County | 4,544 | $111,298 |
| Tract 280King County | 3,538 | $85,482 |
| Tract 289.02King County | 7,428 | $57,651 |
| Tract 262King County | 5,618 | $76,399 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in SeaTac) · Census block assignment files
How does SeaTac compare with other places in Washington?
By the Census Bureau's July 2025 estimates, SeaTac is the 1,204th-most populous of the 19,476 U.S. incorporated places that have one and the 37th-most populous of 281 in Washington.
SeaTac ranks 253rd of 387 places in Washington with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 37th | 281 |
| Growth 2020-2025 (PEP) | 38th | 203 |
| Residents per square mile | 80th | 394 |
| Median household income | 253rd | 387 |
| Per capita income | 269th | 393 |
| Median home value | 188th | 384 |
| Median gross rent | 178th | 351 |
| Poverty rate | 149th | 281 |
| Bachelor's degree or higher | 234th | 382 |
| Median age | 268th | 394 |
| Owner-occupied share | 372nd | 388 |
| Work from home | 225th | 307 |
| Travel time to work | 227th | 394 |
SeaTac's figures with every place in Washington (CSV)
Every place in Washington, sortable · Compare SeaTac with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for SeaTac?
3 of the 57 figures for SeaTac on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for SeaTac are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in SeaTac.