| ZIP Codes: | 120 ZIP Codes (83 Standard, 30 PO Box, 7 Unique) [See All] |
| Area Codes: | 206 / 253 / 360 / 425 / 564 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:14:16 PM |
| Population: | 2,298,714 [See All] |
| FIPS: | 53033 |
| CBSA: | Seattle-Tacoma-Bellevue, WA |
| Land Area: | 2,262 sq mi |
| Water Area: | 97 sq mi |
| Coordinates: | 47.5568, -122.2185 |
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2,298,714 residents live across 120 ZIPs covering 2,262 sq mi, served by 32 distinct USPS-recognized cities.
Population moved from 2,019,450 to 2,298,662 from 2014 to 2024 — a +13.8% change. 72 ZIPs gained residents, 10 lost (and 3 held flat).
The county's wealthiest ZIP 98075 (Sammamish, $250,001 median) and poorest ZIP 98104 (Seattle, $61,460) are 13.5 miles apart — a 4.1× income gap across local geography.
Median home values vary 4.7× across this county — from $421,300 in 98002 (Auburn) to $2,000,001 in 98004 (Bellevue).
Density varies 1507× across the county — from 33 people/sq mi in 98022 (Enumclaw) to 49,500 in 98121 (Seattle).
Most of the decade's growth concentrated around Seattle — top growth ZIPs averaged +2364.7% over the past ten years ( 98195 , 98121 and 98101 ).
Educational attainment ranges from 15.8% bachelor's+ in 98002 (Auburn) to 87.6% in 98039 (Medina) — the breadth of educational profiles across the area.
Within Washington, this is the #1 most populous of 39 counties and ranks #1 for median household income with the #14 fastest decade growth .
On the national stage, King County is the #13 most populous US county , ranks #43 for income .
Hosts 4 single-entity Unique ZIPs: 98195Univ Of Washington ; 98181Seattle ; 98185Safeco Plaza ; and 98191Seattle .
Weighted by population, the typical household earns about $131,803 across the county — reflecting what a typical resident sees, not a simple ZIP average.
56.7% of adults age 25+ hold a bachelor's degree or higher (944,827 of 1,666,334 reporting).
83 Standard delivery, 30 PO Box only, 7 single-entity Unique ZIPs serve this county.
40 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
7 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 4.1× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 98052 | Redmond | Standard | 80,717 | $163,460 | 20.5 | 32.5% |
| 98115 | Seattle | Standard | 54,349 | $156,142 | 9.9 | 11.9% |
| 98133 | Seattle | Standard | 53,249 | $93,662 | 7.2 | 15.2% |
| 98103 | Seattle | Standard | 52,671 | $131,154 | 4.6 | 10.7% |
| 98034 | Kirkland | Standard | 52,531 | $135,219 | 11.7 | 24.1% |
| 98003 | Federal Way | Standard | 51,619 | $75,319 | 11.5 | 13.1% |
| 98118 | Seattle | Standard | 50,500 | $113,762 | 9.0 | 13.6% |
| 98023 | Federal Way | Standard | 50,448 | $104,893 | 10.7 | 2.1% |
| 98092 | Auburn | Standard | 50,224 | $122,300 | 44.2 | 23.7% |
| 98042 | Kent | Standard | 50,216 | $127,552 | 29.8 | 12.6% |
| 98105 | Seattle | Standard | 49,767 | $74,349 | 4.8 | 10.6% |
| 98125 | Seattle | Standard | 44,520 | $99,868 | 6.2 | 18.5% |
| 98122 | Seattle | Standard | 43,234 | $106,886 | 2.4 | 27.0% |
| 98058 | Renton | Standard | 42,980 | $115,201 | 20.2 | 0.5% |
| 98059 | Renton | Standard | 42,406 | $138,654 | 15.9 | 16.2% |
| 98033 | Kirkland | Standard | 40,982 | $182,500 | 11.5 | 15.1% |
| 98032 | Kent | Standard | 40,862 | $82,636 | 17.0 | 13.7% |
| 98198 | Seattle | Standard | 40,463 | $86,239 | 7.5 | 13.2% |
| 98031 | Kent | Standard | 40,094 | $105,965 | 8.0 | 8.5% |
| 98006 | Bellevue | Standard | 40,009 | $198,150 | 11.5 | 8.0% |
| 98004 | Bellevue | Standard | 39,897 | $182,545 | 9.6 | 27.7% |
| 98030 | Kent | Standard | 38,523 | $91,761 | 7.3 | 9.1% |
| 98002 | Auburn | Standard | 37,509 | $78,684 | 7.3 | 9.5% |
| 98001 | Auburn | Standard | 37,460 | $106,791 | 19.4 | 18.0% |
| 98038 | Maple Valley | Standard | 37,324 | $152,261 | 54.8 | 9.5% |
| 98155 | Seattle | Standard | 36,511 | $131,540 | 8.3 | 7.9% |
| 98056 | Renton | Standard | 35,849 | $113,688 | 8.3 | 5.8% |
| 98117 | Seattle | Standard | 35,711 | $182,984 | 3.9 | 12.4% |
| 98168 | Seattle | Standard | 35,528 | $88,083 | 9.2 | 5.7% |
| 98109 | Seattle | Standard | 34,328 | $133,663 | 2.3 | 53.2% |
| 98144 | Seattle | Standard | 33,787 | $96,969 | 5.6 | 22.9% |
| 98074 | Sammamish | Standard | 30,761 | $244,362 | 12.0 | 16.6% |
| 98029 | Issaquah | Standard | 30,586 | $170,759 | 10.6 | 16.8% |
| 98011 | Bothell | Standard | 28,963 | $131,667 | 7.0 | -5.9% |
| 98027 | Issaquah | Standard | 28,955 | $153,301 | 66.0 | 6.7% |
| 98107 | Seattle | Standard | 28,776 | $142,662 | 2.5 | 26.4% |
| 98116 | Seattle | Standard | 28,711 | $126,151 | 2.9 | 20.7% |
| 98106 | Seattle | Standard | 28,690 | $124,212 | 5.6 | 14.7% |
| 98146 | Seattle | Standard | 28,573 | $102,520 | 4.6 | 11.1% |
| 98007 | Bellevue | Standard | 27,692 | $131,109 | 4.5 | 8.5% |
| 98102 | Seattle | Standard | 27,333 | $114,925 | 1.6 | 20.0% |
| 98188 | Seattle | Standard | 27,311 | $76,438 | 8.2 | 12.1% |
| 98008 | Bellevue | Standard | 27,242 | $184,583 | 7.8 | 11.4% |
| 98119 | Seattle | Standard | 26,879 | $123,551 | 2.7 | 14.3% |
| 98178 | Seattle | Standard | 26,748 | $99,505 | 5.8 | 12.1% |
| 98108 | Seattle | Standard | 25,529 | $95,780 | 7.7 | 5.4% |
| 98075 | Sammamish | Standard | 25,498 | $250,001 | 11.7 | 13.4% |
| 98040 | Mercer Island | Standard | 25,307 | $219,069 | 12.7 | 7.1% |
| 98055 | Renton | Standard | 24,660 | $97,224 | 4.4 | 14.5% |
| 98072 | Woodinville | Standard | 24,446 | $175,805 | 18.5 | 8.7% |
| 98112 | Seattle | Standard | 23,921 | $171,572 | 6.9 | 7.3% |
| 98028 | Kenmore | Standard | 23,741 | $139,764 | 7.2 | 11.8% |
| 98126 | Seattle | Standard | 22,975 | $116,466 | 3.3 | 6.1% |
| 98053 | Redmond | Standard | 22,765 | $192,292 | 28.1 | 9.8% |
| 98199 | Seattle | Standard | 22,468 | $180,789 | 4.2 | 9.3% |
| 98022 | Enumclaw | Standard | 22,418 | $120,406 | 682.5 | 5.0% |
| 98166 | Seattle | Standard | 22,082 | $114,969 | 5.7 | 4.2% |
| 98005 | Bellevue | Standard | 21,846 | $160,849 | 7.3 | 22.2% |
| 98121 | Seattle | Standard | 21,166 | $152,019 | 0.4 | 66.0% |
| 98177 | Seattle | Standard | 21,090 | $169,918 | 5.8 | 11.8% |
| 98136 | Seattle | Standard | 17,252 | $149,269 | 2.3 | 12.7% |
| 98101 | Seattle | Standard | 17,153 | $128,882 | 0.5 | 58.8% |
| 98104 | Seattle | Standard | 16,542 | $61,460 | 0.9 | 25.5% |
| 98065 | Snoqualmie | Standard | 15,944 | $198,216 | 49.0 | 20.8% |
| 98045 | North Bend | Standard | 15,289 | $175,765 | 226.7 | 4.4% |
| 98077 | Woodinville | Standard | 14,109 | $184,306 | 17.4 | -0.3% |
| 98057 | Renton | Standard | 12,705 | $68,552 | 7.2 | 4.3% |
| 98019 | Duvall | Standard | 12,242 | $161,212 | 36.7 | 13.2% |
| 98070 | Vashon | Standard | 9,934 | $120,571 | 37.0 | -4.9% |
| 98148 | Seattle | Standard | 9,715 | $87,342 | 2.8 | -4.8% |
| 98014 | Carnation | Standard | 8,264 | $164,306 | 74.6 | 19.7% |
| 98010 | Black Diamond | Standard | 6,857 | $142,048 | 19.6 | 43.2% |
| 98047 | Pacific | Standard | 6,817 | $115,188 | 2.2 | 5.6% |
| 98024 | Fall City | Standard | 3,908 | $160,641 | 22.3 | -34.7% |
| 98051 | Ravensdale | Standard | 3,442 | $136,439 | 89.2 | 1.2% |
| 98039 | Medina | Standard | 2,928 | $250,001 | 3.7 | -4.9% |
| 98195 | Seattle | Unique | 2,757 | — | 1.0 | 6969.2% |
| 98134 | Seattle | Standard | 645 | $68,214 | 3.7 | -24.1% |
| 98164 | Seattle | Standard | 292 | $250,001 | 0.0 | 300.0% |
| 98224 | Baring | PO Box | 190 | $78,636 | 19.3 | -27.2% |
| 98288 | Skykomish | PO Box | 169 | $64,583 | 293.3 | 0.0% |
| 98050 | Preston | PO Box | 108 | — | 2.1 | -48.1% |
| 98025 | Hobart | PO Box | 52 | — | 0.0 | — |
| 98158 | Seattle | Standard | 0 | — | 2.2 | — |
| 98154 | Seattle | Standard | 0 | — | 0.0 | — |
| 98174 | Seattle | Standard | 0 | — | 0.0 | -100.0% |
| 98015 | Bellevue | PO Box | — | — | 0.0 | — |
| 98124 | Seattle | PO Box | — | — | 0.0 | — |
| 98114 | Seattle | PO Box | — | — | 0.0 | — |
| 98194 | Seattle | PO Box | — | — | 0.0 | — |
| 98161 | Seattle | Standard | — | — | 0.0 | — |
| 98111 | Seattle | PO Box | — | — | 0.0 | — |
| 98185 | Seattle | Unique | — | — | 0.0 | — |
| 98191 | Seattle | Unique | — | — | 0.0 | — |
| 98009 | Bellevue | PO Box | — | — | 0.0 | — |
| 98181 | Seattle | Unique | — | — | 0.0 | — |
| 98190 | Seattle | Unique | — | — | 0.0 | — |
| 98131 | Seattle | Standard | — | — | 0.0 | — |
| 98138 | Seattle | PO Box | — | — | 0.0 | — |
| 98062 | Seahurst | PO Box | — | — | 0.0 | — |
| 98013 | Burton | PO Box | — | — | 0.0 | — |
| 98064 | Kent | PO Box | — | — | 0.0 | — |
| 98089 | Kent | PO Box | — | — | 0.0 | — |
| 98035 | Kent | PO Box | — | — | 0.0 | — |
| 98093 | Federal Way | PO Box | — | — | 0.0 | — |
| 98071 | Auburn | PO Box | — | — | 0.0 | — |
| 98063 | Federal Way | PO Box | — | — | 0.0 | — |
| 98129 | Seattle | Unique | — | — | 0.0 | — |
| 98141 | Seattle | PO Box | — | — | 0.0 | — |
| 98170 | Seattle | Unique | — | — | 0.0 | — |
| 98145 | Seattle | PO Box | — | — | 0.0 | — |
| 98139 | Seattle | PO Box | — | — | 0.0 | — |
| 98165 | Seattle | PO Box | — | — | 0.0 | — |
| 98073 | Redmond | PO Box | — | — | 0.0 | — |
| 98127 | Seattle | PO Box | — | — | 0.0 | — |
| 98083 | Kirkland | PO Box | — | — | 0.0 | — |
| 98113 | Seattle | PO Box | — | — | 0.0 | — |
| 98175 | Seattle | PO Box | — | — | 0.0 | — |
| 98041 | Bothell | PO Box | — | — | 0.0 | — |
| 98160 | Seattle | PO Box | — | — | 0.0 | — |