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/LARGEST-POPULATION

ZIP Codes With the Largest Population in Idaho

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 83646 Meridian Ada 76,023
2 83301 Twin Falls Twin Falls 63,592
3 83642 Meridian Ada 62,279
4 83686 Nampa Canyon 60,993
5 83709 Boise Ada 58,928
6 83854 Post Falls Kootenai 54,851
7 83440 Rexburg Madison 51,421
8 83401 Idaho Falls Bonneville 47,972
9 83687 Nampa Canyon 43,135
10 83704 Boise Ada 42,719
11 83815 Coeur d'Alene Kootenai 41,405
12 83605 Caldwell Canyon 41,325
13 83201 Pocatello Bannock 39,902
14 83651 Nampa Canyon 38,121
15 83501 Lewiston Nez Perce 37,520
16 83634 Kuna Ada 36,286
17 83706 Boise Ada 35,524
18 83607 Caldwell Canyon 35,491
19 83616 Eagle Ada 35,413
20 83713 Boise Ada 31,549
21 83402 Idaho Falls Bonneville 29,994
22 83221 Blackfoot Bingham 29,081
23 83714 Garden City Ada 27,564
24 83404 Idaho Falls Bonneville 27,500
25 83705 Boise Ada 26,830
26 83843 Moscow Latah 26,591
27 83814 Coeur d'Alene Kootenai 26,059
28 83442 Rigby Jefferson 25,609
29 83202 Pocatello Bannock 24,513
30 83835 Hayden Kootenai 24,238
31 83702 Boise Ada 24,163
32 83647 Mountain Home Elmore 22,952
33 83338 Jerome Jerome 21,944
34 83716 Boise Elmore 21,402
35 83864 Sandpoint Bonner 20,514
36 83858 Rathdrum Kootenai 20,137
37 83406 Idaho Falls Bonneville 19,696
38 83318 Burley Cassia 19,459
39 83617 Emmett Gem 19,058
40 83204 Pocatello Power 18,580
41 83703 Boise Ada 17,583
42 83669 Star Ada 16,827
43 83644 Middleton Canyon 16,293
44 83333 Hailey Blaine 12,682
45 83350 Rupert Minidoka 12,671
46 83274 Shelley Bingham 11,699
47 83661 Payette Payette 11,105
48 83316 Buhl Twin Falls 10,456
49 83263 Preston Franklin 9,940
50 83341 Kimberly Twin Falls 9,531

Showing the top 50 of 279 ZIP codes in Idaho that have this figure . 83646 ranks 1st at 76,023, against 9,531 in 50th place.

Other rankings for Idaho

Cite this page

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

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