SeaTac, Washington

SeaTac population, 2020 to 2024

SeaTac added 2,637 residents from July 2020 to July 2024, a change of +8.4%. In the latest year it moved by +872. Among 125 Washington places of 5,000 or more, that growth ranks 24th; the median place changed by +2.6%. The median place of 5,000+ in Washington has 18,148 people, so SeaTac is 1.9 times that size.

SeaTac covers 10.06 square miles of land and 0.18 of water, for 3,382 people per square mile of land. The median Washington place of 5,000+ has 2,694, so SeaTac is denser than the typical town.

What county SeaTac is in

All of SeaTac's residents live in King County, which had 2,340,211 residents in 2024. SeaTac holds 1.5% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in SeaTac

5 ZIP Code Tabulation Areas (ZCTAs) overlap SeaTac by at least 10% of the ZCTA's or the city's land: 98148, 98158, 98168, 98188, 98198. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where SeaTac is

The Census internal point of SeaTac is at 47.443400, -122.298300. Olympia, the capital, is 39.9 miles SW in a straight line. The nearest larger place is Burien, WA (52,046 people), 3.1 miles away. The nearest city of 100,000 or more is Renton, WA, 5.5 miles away.

Daylight in SeaTac

At 47.44° N, SeaTac gets about 15 h 58 min of daylight around the June solstice and 8 h 27 min around the December solstice, a swing of 7 h 31 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near SeaTac

The eight nearest incorporated places of 1,000+ in Washington, measured between internal points. The closest is Normandy Park, 2.3 miles away, with 6,661 people.