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-POPULATION

ZIP Codes With the Largest Population in Washington

What this measures. Population of the Census tabulation area, ACS 5-year estimate. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Population
1 99301 Pasco Franklin 87,044
2 98052 Redmond King 80,717
3 98012 Bothell Snohomish 77,041
4 98682 Vancouver Clark 68,305
5 98208 Everett Snohomish 60,915
6 98391 Bonney Lake Pierce 59,240
7 99208 Spokane Spokane 58,669
8 98270 Marysville Snohomish 55,049
9 98115 Seattle King 54,349
10 98133 Seattle King 53,249
11 98258 Lake Stevens Snohomish 52,752
12 98103 Seattle King 52,671
13 98034 Kirkland King 52,531
14 98003 Federal Way King 51,619
15 98387 Spanaway Pierce 50,774
16 98661 Vancouver Clark 50,743
17 99336 Kennewick Benton 50,735
18 98632 Longview Cowlitz 50,635
19 98118 Seattle King 50,500
20 98023 Federal Way King 50,448
21 98092 Auburn King 50,224
22 98042 Kent King 50,216
23 98225 Bellingham Whatcom 50,216
24 98105 Seattle King 49,767
25 98837 Moses Lake Grant 49,455
26 98374 Puyallup Pierce 49,007
27 98501 Olympia Thurston 48,067
28 98226 Bellingham Whatcom 46,782
29 98223 Arlington Snohomish 46,497
30 98902 Yakima Yakima 46,492
31 98801 Wenatchee Chelan 45,426
32 98204 Everett Snohomish 45,130
33 98125 Seattle King 44,520
34 98122 Seattle King 43,234
35 99205 Spokane Spokane 43,169
36 98058 Renton King 42,980
37 99362 Walla Walla Walla Walla 42,853
38 98059 Renton King 42,406
39 98036 Lynnwood Snohomish 42,370
40 98087 Lynnwood Snohomish 41,796
41 98503 Lacey Thurston 41,656
42 99206 Spokane Spokane 41,089
43 98033 Kirkland King 40,982
44 98277 Oak Harbor Island 40,917
45 98032 Kent King 40,862
46 98584 Shelton Mason 40,606
47 98198 Seattle King 40,463
48 98031 Kent King 40,094
49 98006 Bellevue King 40,009
50 98004 Bellevue King 39,897

Showing the top 50 of 605 ZIP codes in Washington that have this figure . 99301 ranks 1st at 87,044, against 39,897 in 50th place.

Other rankings for Washington

Cite this page

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

Underlying data is public domain or openly licensed — sources, vintages and licences.