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/OLDEST

ZIP Codes With the Oldest Population in Iowa

What this measures. Median age of residents, ACS 5-year estimate. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Median age
1 52588 Selma Van Buren 73.3
2 51044 Oto Woodbury 72.7
3 50102 Garden City Hardin 71.6
4 51061 Washta Cherokee 70.8
5 51647 Northboro Page 70.5
6 50608 Austinville Butler 69.9
7 50860 Redding Ringgold 68.2
8 50556 Ledyard Kossuth 67.9
9 50074 Ellston Ringgold 67.6
10 50559 Lone Rock Kossuth 67.1
11 50839 Carbon Adams 66.8
12 50605 Aredale Franklin 66.5
13 52075 Springbrook Jackson 65.5
14 50573 Plover Pocahontas 65.4
15 50110 Gray Audubon 65.2
16 51577 Walnut Pottawattamie 64.9
17 51331 Arnolds Park Dickinson 64.8
18 52146 Harpers Ferry Allamakee 64.1
19 52225 Elberon Tama 63.8
20 50104 Gibson Keokuk 63.6
21 50274 Wiota Cass 63.6
22 50831 Arispe Union 63.5
23 50527 Curlew Palo Alto 63.3
24 51578 Westphalia Shelby 63.3
25 51451 Lanesboro Carroll 63.0
26 50455 Mc Intire Mitchell 62.9
27 50571 Palmer Pocahontas 62.9
28 51432 Aspinwall Crawford 62.9
29 52257 Luzerne Benton 62.3
30 50857 Nodaway Adams 62.1
31 51036 Maurice Sioux 61.9
32 51447 Kirkman Shelby 61.5
33 51648 Percival Fremont 61.5
34 52308 Millersburg Iowa 61.4
35 52569 Melrose Monroe 61.4
36 50051 Clemons Marshall 61.3
37 51650 Riverton Fremont 61.3
38 52562 Hayesville Keokuk 61.3
39 50222 Peru Madison 61.2
40 52077 Volga Clayton 60.9
41 50042 Brayton Audubon 60.8
42 50593 Varina Pocahontas 60.8
43 50654 Masonville Buchanan 60.8
44 52745 Dixon Scott 60.7
45 51011 Chatsworth Sioux 60.5
46 51051 Rodney Monona 60.5
47 50837 Bridgewater Adair 60.2
48 52050 Greeley Delaware 60.2
49 52170 Waterville Allamakee 60.1
50 50027 Barnes City Mahaska 60.0

Showing the top 50 of 966 ZIP codes in Iowa that have this figure . 52588 ranks 1st at 73.3, against 60.0 in 50th place.

Other rankings for Iowa

Cite this page

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

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