ZIP Codes in Washington State
Washington's ZIP codes cover a state sharply divided by the Cascade Mountains - a wet, densely populated west anchored by Seattle, and a much drier, more agricultural east centered around Spokane. With around 7.8 million residents, Washington's population concentrates overwhelmingly in the Puget Sound region, home to some of the largest tech companies in the world.
How ZIP Codes Are Organized Across the State
Washington's ZIP codes fall within the 98000–99499 range under the USPS system. Seattle and the surrounding Puget Sound region occupy the lower end around 981xx, Tacoma sits near 984xx, and Spokane, in the drier eastern part of the state, carries codes closer to 992xx.
Washington's Major Metro Areas by Population
The chart below shows just how dominant the Seattle metro area is within Washington's overall population, dwarfing Spokane and every other city in the state.
Seattle's ZIP codes cover Washington's largest city and one of the most important tech hubs in the world, home to Amazon and Microsoft's headquarters along with a dense concentration of other major tech employers. Tacoma, just south, has grown into its own significant city, benefiting from relative affordability compared to Seattle while remaining within commuting distance. For a broader comparison, our full US ZIP code directory shows how Washington's ranges fit alongside every other state.
Eastern Washington and Spokane
East of the Cascade Mountains, Washington's climate and economy shift dramatically - Spokane anchors a drier, more agricultural region built around wheat farming, closer in character to neighboring Idaho than to the rain-soaked, tech-driven Puget Sound area. ZIP codes here reflect a noticeably lower cost of living and slower growth than the booming Seattle metro.
Vancouver and the Oregon Border
Vancouver, Washington sits directly across the Columbia River from Portland, Oregon, and many residents take advantage of Washington's lack of state income tax while shopping across the river in Oregon, which has no sales tax - a mutually beneficial arrangement that has shaped both cities' retail and housing patterns for decades.
Why ZIP Codes Matter Beyond Mail
In Washington, ZIP codes carry enormous weight in the Seattle real estate market, where proximity to major tech campuses can add significant premiums to home prices even between neighboring ZIP codes. Eastern Washington's wheat farming industry relies on ZIP-level data for shipping logistics through the Columbia River system. And the state's lack of income tax continues to influence population and business location decisions, particularly near the Oregon border around Vancouver.
Border Regions and Neighboring States
Washington shares borders with two US states and a long international border with British Columbia, Canada to the north. To the south, the Columbia River separates the state from Oregon. To the east, Idaho's panhandle shares similar terrain with eastern Washington near Spokane.
Finding the Right ZIP Code
Use the list below to browse Washington's ZIP codes by city, county, or population - sorted so the most populous areas surface first. Each entry links through to a detailed page with additional demographic data. If you're trying to identify the ZIP code for a specific address rather than browsing by city, the search tool at the top of this page will get you there faster than scrolling through the full list.
Frequently Asked Questions
How many ZIP codes does Washington have?
Washington has several hundred ZIP codes, concentrated most heavily around the Seattle metro area, with far fewer covering the drier, more agricultural eastern part of the state.
What ZIP code range does Washington use?
Washington ZIP codes generally fall between 98000 and 99499, with Seattle toward the lower end and eastern Washington, including Spokane, further along the range.
Which Washington city has the most ZIP codes?
Seattle and its surrounding Puget Sound suburbs account for the largest number of individual ZIP codes by a wide margin.
Can I look up a Washington ZIP code by city name?
Yes, use the search tool on this page or browse the full list below, which is organized by city and sorted by population.
Whether you're relocating to Seattle's tech corridor, researching property near Spokane, or simply trying to pin down the right ZIP code for a specific Washington address, the data below covers every corner of the state.