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/YOUNGEST

ZIP Codes With the Youngest Population in Washington

What this measures. Median age of residents, lowest first. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Median age
1 99363 Wallula Walla Walla 6.2
2 98921 Buena Yakima 15.6
3 98195 Seattle King 19.3
4 99251 Spokane Spokane 19.5
5 99258 Spokane Spokane 19.8
6 98505 Olympia Thurston 19.9
7 98416 Tacoma Pierce 20.3
8 98447 Tacoma Pierce 20.4
9 98824 George Grant 21.4
10 98314 Bremerton Kitsap 21.8
11 98278 Oak Harbor Island 22.0
12 98315 Silverdale Kitsap 22.0
13 98438 Mcchord Afb Pierce 22.4
14 99321 Beverly Grant 22.5
15 99011 Fairchild Air Force Base Spokane 22.6
16 98430 Camp Murray Pierce 22.9
17 98433 Tacoma Pierce 23.0
18 99163 Pullman Whitman 23.4
19 99343 Mesa Franklin 24.0
20 98207 Everett Snohomish 24.1
21 98932 Granger Yakima 24.2
22 98105 Seattle King 24.6
23 98817 Chelan Falls Chelan 24.8
24 98439 Lakewood Pierce 25.1
25 99330 Eltopia Franklin 26.0
26 99344 Othello Adams 26.8
27 98935 Mabton Yakima 27.0
28 98859 Wauconda Okanogan 28.1
29 98948 Toppenish Yakima 28.1
30 98944 Sunnyside Benton 28.7
31 99333 Hooper Whitman 28.9
32 98813 Bridgeport Douglas 29.4
33 99349 Mattawa Grant 29.4
34 98926 Ellensburg Kittitas 30.2
35 98951 Wapato Yakima 30.4
36 98930 Grandview Yakima 30.5
37 99301 Pasco Franklin 30.6
38 98562 Moclips Grays Harbor 30.9
39 99004 Cheney Spokane 31.0
40 98936 Moxee Yakima 31.1
41 98355 Mineral Lewis 31.2
42 99357 Royal City Grant 31.4
43 98276 Nooksack Whatcom 31.6
44 98424 Tacoma Pierce 31.6
45 98109 Seattle King 31.7
46 98225 Bellingham Whatcom 31.8
47 98565 Napavine Lewis 31.9
48 98952 White Swan Yakima 31.9
49 98823 Ephrata Grant 32.0
50 98122 Seattle King 32.4

Showing the top 50 of 590 ZIP codes in Washington that have this figure . 99363 ranks 1st at 6.2, against 32.4 in 50th place.

Other rankings for Washington

Cite this page

zipcodes.pro. “ZIP Codes With the Youngest Population in Washington.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/wa/youngest

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