Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — RANKINGS/WA/LARGEST-AREA

Largest ZIP Codes in Washington by Land Area

What this measures. Land area of the Census tabulation area, in square miles. Water is excluded. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 98826 Leavenworth Chelan 1,015.63 sq mi
2 98926 Ellensburg Kittitas 938.11 sq mi
3 98331 Forks Jefferson 929.87 sq mi
4 98937 Naches Yakima 864.91 sq mi
5 99347 Pomeroy Garfield 769.69 sq mi
6 98022 Enumclaw King 726.57 sq mi
7 99114 Colville Stevens 718.55 sq mi
8 99169 Ritzville Adams 715.46 sq mi
9 99328 Dayton Columbia 657.29 sq mi
10 98855 Tonasket Okanogan 632.32 sq mi
11 99141 Kettle Falls Ferry 628.12 sq mi
12 99122 Davenport Lincoln 601.08 sq mi
13 99350 Prosser Benton 600.07 sq mi
14 99138 Inchelium Ferry 566.57 sq mi
15 98944 Sunnyside Benton 544.64 sq mi
16 99348 Prescott Walla Walla 534.31 sq mi
17 98840 Okanogan Okanogan 532.97 sq mi
18 98833 Mazama Okanogan 499.93 sq mi
19 98816 Chelan Chelan 494.16 sq mi
20 99301 Pasco Franklin 486.29 sq mi
21 98837 Moses Lake Grant 486.20 sq mi
22 99344 Othello Adams 485.10 sq mi
23 99159 Odessa Lincoln 481.26 sq mi
24 99166 Republic Ferry 479.36 sq mi
25 98363 Port Angeles Clallam 478.37 sq mi
26 98862 Winthrop Okanogan 477.97 sq mi
27 98620 Goldendale Klickitat 468.27 sq mi
28 98283 Rockport Whatcom 467.98 sq mi
29 98244 Deming Whatcom 463.66 sq mi
30 98848 Quincy Grant 456.77 sq mi
31 98856 Twisp Okanogan 444.43 sq mi
32 99140 Keller Ferry 443.11 sq mi
33 98822 Entiat Chelan 436.96 sq mi
34 98241 Darrington Snohomish 422.28 sq mi
35 99115 Coulee City Douglas 420.01 sq mi
36 98237 Concrete Skagit 417.43 sq mi
37 98922 Cle Elum Kittitas 416.22 sq mi
38 98563 Montesano Grays Harbor 414.70 sq mi
39 98830 Mansfield Douglas 410.39 sq mi
40 98952 White Swan Yakima 388.79 sq mi
41 99119 Cusick Pend Oreille 373.06 sq mi
42 98858 Waterville Douglas 367.06 sq mi
43 98577 Raymond Pacific 363.51 sq mi
44 98584 Shelton Mason 359.49 sq mi
45 99341 Lind Adams 346.99 sq mi
46 98288 Skykomish King 346.41 sq mi
47 98361 Packwood Lewis 344.88 sq mi
48 99402 Asotin Asotin 336.35 sq mi
49 98948 Toppenish Yakima 335.34 sq mi
50 99004 Cheney Spokane 334.27 sq mi

Showing the top 50 of 605 ZIP codes in Washington that have this figure and meet the threshold above. 98826 ranks 1st at 1,015.63 sq mi, against 334.27 sq mi in 50th place.

Other rankings for Washington

Cite this page

zipcodes.pro. “Largest ZIP Codes in Washington by Land Area.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/wa/largest-area

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