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Seattle ZIP codes: US ZIP code list for Seattle, Washington (WA)

Quick answer

Seattle, Washington has 12 US ZIP codes, running 98101 to 98122 inside King County. Each carries the same 10.45% combined sales tax rate. ZIP boundaries are postal delivery routes, not tax boundaries — a code that crosses a city or district line can hold more than one rate, so destination-based sellers should validate by full street address.

ZIP codes
12Median covered metro: 12
Number span
2298101 to 98122
Sorting prefixes
981USPS sectional centers
Sales tax
10.45%Same in every listed code

Seattle ZIP code footprint

How Seattle's ZIP footprint compares with national norms.

12 ZIP codes are listed for Seattle, covering a population of 755,078. They span 22 numbers, 98101 through 98122. The median covered metro on this site lists 12 codes; Seattle ranks 2 of 94 by count. Large metros carry more codes because USPS splits a delivery area once carrier volume outgrows one route cluster, not because the city is geographically bigger.

All 12 codes share the 981 prefix. That first trio is the sectional center facility — the USPS plant that sorts mail for the region — so every piece addressed to Seattle passes through one facility. The range runs 98101 to 98122.

ZIP boundaries are carrier routes, not city limits. USPS redraws them when delivery volume shifts; Washington redraws tax and municipal lines on a different schedule entirely. A Seattle mailing address does not prove an address sits inside Seattle city limits, and a single code can straddle the boundary.

ZIP codes in Seattle

All within King County, Washington.

Source: Washington State Department of Revenue rate tables · rates as published for 2026

Why ZIP-based rate lookup is unreliable

USPS redraws ZIP codes when carrier routes change. Tax jurisdictions move with annexations, county lines and voter-approved districts. The two never line up. In Washington, local jurisdictions set their own increments, so remote sellers should validate the full delivery address against the Washington State Department of Revenue lookup at the time of sale.

Frequently asked questions

Common questions about this area.

How many ZIP codes does Seattle have?
12. They run from 98101 to 98122 across 1 sectional center prefix (981), spanning 22 numbers.
What is the first ZIP code in Seattle, WA?
98101 is the lowest-numbered code serving Seattle. Numbering runs roughly northeast to west nationally, so Seattle's 981 prefix reflects its position in the Washington sorting network, not its size.
Do all Seattle ZIP codes have the same sales tax rate?
Inside Seattle city limits, yes — 10.45% applies. A code that extends past the city line can carry a different rate on part of its territory. Validate by street address, not ZIP, when the sale is destination-based. Confirm current rates with your state revenue agency before filing.

Seattle sales tax breakdown and calculator

Other Seattle datasets on this site.

Statewide: Washington cities · Washington ZIP codes · Washington sales tax · Washington counties