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/SMALLEST-AREA

Smallest ZIP Codes in Washington by Land Area

What this measures. Land area of the Census tabulation area, smallest first. These are almost always dense urban ZIP codes covering a few city blocks. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 98154 Seattle King 0.00 sq mi
2 98164 Seattle King 0.00 sq mi
3 98174 Seattle King 0.00 sq mi
4 98559 Malone Grays Harbor 0.02 sq mi
5 99174 Steptoe Whitman 0.03 sq mi
6 98364 Port Gamble Kitsap 0.04 sq mi
7 99020 Marshall Spokane 0.04 sq mi
8 98558 Mckenna Pierce 0.07 sq mi
9 98609 Carrolls Cowlitz 0.07 sq mi
10 98416 Tacoma Pierce 0.09 sq mi
11 98544 Galvin Lewis 0.10 sq mi
12 99014 Four Lakes Spokane 0.10 sq mi
13 98583 Satsop Grays Harbor 0.10 sq mi
14 98447 Tacoma Pierce 0.11 sq mi
15 98314 Bremerton Kitsap 0.12 sq mi
16 98556 Littlerock Thurston 0.12 sq mi
17 99258 Spokane Spokane 0.16 sq mi
18 98921 Buena Yakima 0.18 sq mi
19 99151 Marcus Stevens 0.18 sq mi
20 99251 Spokane Spokane 0.18 sq mi
21 98238 Conway Skagit 0.23 sq mi
22 98565 Napavine Lewis 0.23 sq mi
23 98263 Lyman Skagit 0.24 sq mi
24 98207 Everett Snohomish 0.25 sq mi
25 98505 Olympia Thurston 0.29 sq mi
26 99102 Albion Whitman 0.34 sq mi
27 98235 Clearlake Skagit 0.34 sq mi
28 99124 Elmer City Okanogan 0.35 sq mi
29 98623 Husum Klickitat 0.39 sq mi
30 98430 Camp Murray Pierce 0.39 sq mi
31 98195 Seattle King 0.40 sq mi
32 99039 Waverly Spokane 0.41 sq mi
33 98121 Seattle King 0.44 sq mi
34 99329 Dixie Walla Walla 0.46 sq mi
35 98539 Doty Lewis 0.49 sq mi
36 98345 Keyport Kitsap 0.50 sq mi
37 98811 Ardenvoir Chelan 0.51 sq mi
38 98101 Seattle King 0.53 sq mi
39 98939 Parker Yakima 0.62 sq mi
40 98255 Hamilton Skagit 0.66 sq mi
41 98276 Nooksack Whatcom 0.71 sq mi
42 98385 South Prairie Pierce 0.74 sq mi
43 98353 Manchester Kitsap 0.80 sq mi
44 98943 South Cle Elum Kittitas 0.83 sq mi
45 98817 Chelan Falls Chelan 0.93 sq mi
46 98104 Seattle King 0.95 sq mi
47 98824 George Grant 0.96 sq mi
48 98438 Mcchord Afb Pierce 0.96 sq mi
49 98562 Moclips Grays Harbor 0.98 sq mi
50 98403 Tacoma Pierce 1.00 sq mi

Showing the top 50 of 605 ZIP codes in Washington that have this figure and meet the threshold above. 98154 ranks 1st at 0.00 sq mi, against 1.00 sq mi in 50th place.

Other rankings for Washington

Cite this page

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

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