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Zip Code 98121 — Seattle, WA

98121 is a ZIP Code associated with Seattle, WA, located within King. The postal region supports an estimated population of 21,166 residents across Data Pending housing units, with a population density of 18,426.7 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (47.615480, -122.346680)

Data MetricLocal Statistic
Postal / Zip Code98121
Primary CitySeattle
State / ProvinceWA
CountyKing
Total Population21,166
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density18,426.7 people/sq mi
TimezoneAmerica/Los_Angeles

How 98121 Compares

MetricZIP 98121King CountyWA State Average
Population21,1662,298,7147,816,021
Median IncomeData PendingN/AN/A
Population Density18,426.7 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 98101Seattle0.6 mi17,153N/A
Zip 98154Seattle0.9 miN/AN/A
Zip 98174Seattle0.9 miN/AN/A
Zip 98164Seattle0.9 mi292N/A
Zip 98109Seattle1.1 mi34,328N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →