Zip Code 98188
Seatac, Washington — King County
📍 ZIP code 98188 is in Seatac, King County, Washington.
ZIP code 98188 is located in Seatac, King County, Washington. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 26,769. The area code for ZIP code 98188 is 206.
Quick Answer
Zip code 98188 is in Seatac, Washington (King County). It has a population of 26,769, median household income of $76,559, and median home value of $452,900.
Population
26,769
Income
$76,559
Home Value
$452,900
Climate
77°F / 38°F
About Zip Code 98188
Zip code 98188 is located in Seatac, Washington, within King County. Home to approximately 26,769 residents, this area sits at an elevation of 332 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 206.
The median household income is $76,559 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $452,900, and the cost of living index is 134 (34% above the national average of 100).
Summers average a high of 77°F while winters drop to 38°F. The area receives about 39 in of rain and 6 in of snow annually. The zip code covers 7.5 square miles of land area and 0.3 square miles of water.
Key Statistics
26,769
$76,559
$452,900
Pacific (PST/PDT)
206
332 ft
7.5 sq mi
36.8
12,025
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Compare With Nearby Zip Codes
| Metric | 98188 | 98148 | 98168 | 98055 | 98166 | 98178 |
|---|---|---|---|---|---|---|
| City | Seatac, WA | Burien, WA | Seatac, WA | Renton, WA | Burien, WA | Seattle, WA |
| Population | 26,769 | 10,399 | 34,814 | 24,851 | 22,001 | 25,929 |
| Median Income | $76,559 | $86,994 | $84,937 | $100,207 | $112,191 | $93,786 |
| Home Value | $452,900 | $576,400 | $500,600 | $561,600 | $785,700 | $628,200 |
| Cost of Living | 134 | 152 | 143 | 155 | 213 | 178 |
| Median Age | 36.8 | 34.9 | 38 | 34.6 | 43.7 | 40.7 |
Cost of Living
100 = National Average. Seatac's cost of living is 34% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
5.9x
Demographics
Zip code 98188 has a population of 26,769 people with a median age of 36.8. There are 12,025 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Seatac (98188) population trend from 2010 to 2024
↓ -43.5%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
77°F
38°F
39 in
6 in
Seatac experiences mild summers with average highs around 77°F. Winters are mild with lows averaging 38°F. The area receives about 6 in of snow per year.
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Housing & Economy
Median Home Value
$452,900
Median Household Income
$76,559
With 12,025 housing units across 7.5 square miles, 98188 has a housing density of 1,603 units per square mile. The home price-to-income ratio is 5.9x.
Location & Geography
Latitude
47.4466°
Longitude
-122.2721°
Land Area
7.5 sq mi
Water Area
0.3 sq mi
Nearby Zip Codes
Zip codes closest to 98188 (Seatac, WA) with distances:
All Zip Codes in Seatac, WA
Other zip codes serving Seatac:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 98188's $76,559. A way to compare Seatac to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 98188 (Seatac, WA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Seatac, Washington?
Seatac, Washington uses zip code 98188 along with 1 other zip codes.
What county is zip code 98188 in?
Zip code 98188 is located in King County, Washington.
What is the population of zip code 98188?
The population of zip code 98188 is 26,769 with a median age of 36.8.
Is 98188 in Seatac, Washington?
Yes, zip code 98188 is in Seatac, King County, Washington. The area code is 206.
Frequently Asked Questions
What city is zip code 98188 in?
Zip code 98188 is in Seatac, Washington. It is part of King County and uses the Pacific (PST/PDT) timezone.
What is zip code 98188?
Zip code 98188 is a U.S. postal code in Seatac, Washington (King County). It has a population of 26,769 and covers 7.5 square miles.
What is the population of zip code 98188?
The population of zip code 98188 (Seatac, WA) is 26,769 with a median age of 36.8. There are approximately 12,025 housing units in this area.
What is the median income in zip code 98188?
The median household income in zip code 98188 (Seatac, WA) is $76,559 per year. The cost of living index is 134 (100 = national average).
What is the average home price in zip code 98188?
The median home value in zip code 98188 (Seatac, WA) is $452,900. The cost of living index is 134 compared to the national average of 100.
What county is zip code 98188 in?
Zip code 98188 is located in King County, Washington. The primary city is Seatac.
What is the area code for zip code 98188?
Zip code 98188 in Seatac, WA uses area code 206. It is located in the Pacific (PST/PDT) timezone.
Is zip code 98188 a good place to live?
Zip code 98188 (Seatac, WA) has a cost of living index of 134 (100 = national average), a median household income of $76,559, and median home values of $452,900. The median age is 36.8. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 98188?
The cost of living index for zip code 98188 (Seatac, WA) is 134, where 100 represents the national average. This area is above the national average. Median home value: $452,900.
What schools serve zip code 98188?
Zip code 98188 in Seatac, Washington is served by the local school district of King County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.