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/ID/YOUNGEST

ZIP Codes With the Youngest Population in Idaho

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 83424 Felt Teton 17.6
2 83460 Rexburg Madison 18.6
3 83844 Moscow Latah 19.4
4 83440 Rexburg Madison 21.3
5 83209 Pocatello Bannock 21.4
6 83648 Mountain Home Afb Elmore 22.9
7 83311 Albion Cassia 26.6
8 83448 Sugar City Madison 26.7
9 83337 Hill City Elmore 27.0
10 83237 Franklin Franklin 27.3
11 83232 Dayton Franklin 27.6
12 83320 Carey Blaine 27.7
13 83427 Iona Bonneville 27.9
14 83347 Paul Minidoka 28.0
15 83286 Weston Franklin 29.0
16 83450 Terreton Jefferson 29.3
17 83344 Murtaugh Cassia 29.4
18 83435 Monteview Jefferson 29.6
19 83323 Declo Cassia 29.7
20 83843 Moscow Latah 29.7
21 83217 Bancroft Caribou 30.1
22 83443 Ririe Bonneville 30.3
23 83238 Geneva Bear Lake 30.5
24 83706 Boise Ada 30.5
25 83203 Fort Hall Bingham 30.6
26 83239 Georgetown Bear Lake 31.1
27 83423 Dubois Clark 31.7
28 83335 Hazelton Jerome 31.8
29 83401 Idaho Falls Bonneville 31.9
30 83244 Howe Butte 32.2
31 83438 Parker Fremont 32.2
32 83605 Caldwell Canyon 32.4
33 83201 Pocatello Bannock 32.6
34 83324 Dietrich Lincoln 32.6
35 83436 Newdale Madison 32.6
36 83283 Thatcher Franklin 32.9
37 83402 Idaho Falls Bonneville 32.9
38 83442 Rigby Jefferson 32.9
39 83210 Aberdeen Bingham 33.1
40 83318 Burley Cassia 33.2
41 83211 American Falls Power 33.4
42 83444 Roberts Jefferson 33.4
43 83338 Jerome Jerome 33.7
44 83355 Wendell Gooding 33.7
45 83626 Greenleaf Canyon 33.7
46 83277 Springfield Bingham 33.8
47 83330 Gooding Gooding 33.8
48 83687 Nampa Canyon 33.8
49 83221 Blackfoot Bingham 34.2
50 83445 Saint Anthony Fremont 34.2

Showing the top 50 of 272 ZIP codes in Idaho that have this figure . 83424 ranks 1st at 17.6, against 34.2 in 50th place.

Other rankings for Idaho

Cite this page

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

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