SeaTac, Washington Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
SeaTac, WA Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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B
Health Around average
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C
Income Below average
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D
Education Well below average
Source: Map AI Methodology
Population
| Metric | SeaTac | Washington Avg | U.S. Average |
|---|---|---|---|
| Population | 36,350 | 7,801,159 | 337,468,954 |
| Population density (per sq mi) | 3550.0 | 109.3 | 86.4 |
| Population growth (%/yr) | 1.65% | 1.21% | 0.59% |
| Median age | 37.0 | 36.2 | 37.3 |
| Households | 13,229 | 3,058,619 | 130,235,071 |
Population in SeaTac grew by 24.9% from 2009 to 2024, reaching 36,350 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in SeaTac is Millennials, aged 29–44, at 26.3% of residents. That is 2.9 points above Washington as a whole.
- Gen Z 13–28 7,766 21.4% on par
- Millennials 29–44 9,546 26.3% +2.9 pts
- Gen X 45–60 7,219 19.9% +0.4 pts
- Boomers 61–79 4,545 12.5% -3.8 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Washington, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 47.6% of the people living in SeaTac and men 52.4%.
- Women 47.6% Washington 49.7%
- Men 52.4% Washington 50.3%
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Economy
SeaTac has a the economy index of C, which means it is somewhat prosperous.
| Metric | SeaTac | Washington Avg | U.S. Average |
|---|---|---|---|
| Median household income | $78,744 | $98,224 | $80,455 |
| Income growth (%/yr) | 6.93% | 5.64% | 4.80% |
| Unemployment rate | 7.3% | 5.0% | 5.2% |
The median household income in SeaTac is about 20% lower than in Washington.
Housing
| Metric | SeaTac | Washington Avg | U.S. Average |
|---|---|---|---|
| Median home price | $801,989 | $485,016 | $248,835 |
| Median rent | $1,694 | $1,759 | $1,407 |
| Homeownership rate | 44.8% | 63.8% | 65.2% |
The median home price in SeaTac is about 39.4 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,694 per month for that long.
Commute Time & Mobility
Commuters in SeaTac spend about 46 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 191 hours, about 8.0 full days, spent commuting.
| Metric | SeaTac | Washington Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 22.9 | 22.4 | 22.4 |
| Round-trip commute (min) | 45.8 | 44.8 | 44.8 |
| Yearly time spent (hours) | 191 | 187 | 187 |
| Estimated yearly cost | $5,918 | $5,785 | $5,790 |
| Work from home | 11.6% | 19.8% | 15.0% |
| Highway traffic (vehicles/day) | 20,619 | 10,119 | 8,813 |
| Local road traffic (vehicles/day) | 3,869 | 1,525 | 1,355 |
The average commute time in SeaTac is 23 minutes, longer than the 22 minutes in Washington.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
SeaTac has a education index of D, which means it is barely educated.
| Metric | SeaTac | Washington Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 23.1% | 35.1% | 31.6% |
| Average household size | 2.69 | 2.50 | 2.53 |
Health
SeaTac has a health index of B, which means it is quite healthy.
| Metric | SeaTac | Washington Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 79.4 | 79.6 | 78.3 |
| Self-rated poor health | 15.0% | 15.4% | 16.3% |
| Smokers | 14.9% | 16.4% | 19.0% |
SeaTac, WA Compared With Nearby Cities
How SeaTac, WA compares with the 2 cities closest to it.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| SeaTac, WA | 36,350 | $78,744 #3/3 | $801,989 #1/3 | 22.9 min #1/3 |
| Burien, WA | 47,382 | $93,761 | $771,957 | 23.7 min |
| Des Moines, WA | 30,822 | $90,886 | $773,942 | 28.4 min |
Frequently Asked Questions
Common questions about SeaTac, Washington.
How many people live in SeaTac, Washington?
About 36,350 people live in SeaTac, Washington, in 13,229 households of 2.7 people on average. The median age is 37.0, close to the U.S. median of 37.3.
Is SeaTac, Washington urban or rural?
Averaged over its land area, SeaTac, Washington has 3,550 people per square mile, a density typical of a city. That is about 41 times the U.S. average of 86.
Is SeaTac, Washington an affordable place to live?
The median home costs 10.2 times the median household income ($801,989 against $78,744), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $1,694 a month takes about 26% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
Is unemployment high in SeaTac, Washington?
Unemployment in SeaTac, Washington is 7.3%, well above the U.S. rate of 5.2%, so job seekers may face more competition than elsewhere.
How common is a college degree in SeaTac, Washington?
23.1% of adults in SeaTac, Washington hold a bachelor's degree or higher (about 1 in 4), well below the U.S. share of 31.6%.
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