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/IA/YOUNGEST

ZIP Codes With the Youngest Population in Iowa

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 50592 Truesdale Buena Vista 12.5
2 51231 Archer O'Brien 15.1
3 52242 Iowa City Johnson 19.1
4 50012 Ames Story 19.3
5 50013 Ames Story 19.4
6 51554 Mineola Mills 20.4
7 52652 Swedesburg Henry 20.6
8 50014 Ames Story 23.3
9 50460 Orchard Mitchell 24.7
10 52552 Drakesville Davis 24.8
11 52354 Watkins Benton 25.1
12 52557 Fairfield Jefferson 25.1
13 52620 Bonaparte Van Buren 25.7
14 50641 Hazleton Buchanan 25.9
15 52570 Milton Van Buren 25.9
16 50067 Decatur Decatur 26.1
17 51111 Sioux City Woodbury 26.4
18 50174 Murray Clarke 26.7
19 51008 Brunsville Plymouth 26.9
20 51430 Arcadia Carroll 27.6
21 52237 Hopkinton Delaware 27.7
22 52771 Teeds Grove Clinton 28.2
23 50518 Barnum Webster 28.3
24 52246 Iowa City Johnson 28.3
25 50309 Des Moines Polk 28.4
26 52561 Fremont Mahaska 28.5
27 52240 Iowa City Johnson 28.6
28 50010 Ames Story 28.8
29 52590 Seymour Wayne 28.8
30 52624 Denmark Lee 28.9
31 50521 Burnside Webster 29.3
32 52254 Lost Nation Clinton 29.5
33 51105 Sioux City Woodbury 29.6
34 51460 Ricketts Crawford 29.6
35 52162 Postville Allamakee 29.6
36 52163 Protivin Howard 29.6
37 52307 Middle Amana Iowa 29.8
38 52221 Guernsey Poweshiek 29.9
39 50613 Cedar Falls Black Hawk 30.0
40 50140 Lamoni Decatur 30.3
41 50160 Martensdale Warren 30.3
42 51436 Breda Carroll 30.4
43 50062 Melcher Dallas Marion 30.6
44 52134 Chester Howard 30.6
45 52801 Davenport Scott 30.6
46 52217 Clutier Tama 30.7
47 52334 South Amana Iowa 30.7
48 52543 Cedar Mahaska 30.7
49 50311 Des Moines Polk 30.8
50 52749 Fruitland Muscatine 30.8

Showing the top 50 of 966 ZIP codes in Iowa that have this figure . 50592 ranks 1st at 12.5, against 30.8 in 50th place.

Other rankings for Iowa

Cite this page

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

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