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/IN/HIGHEST-DENSITY

Most Densely Populated ZIP Codes in Indiana

What this measures. People per square mile of land area. Source: Census American Community Survey and Gazetteer, data release 2026-10-12.

# ZIP City County People per sq mi
1 47435 Helmsburg Brown 27,400
2 47306 Muncie Delaware 14,379
3 47406 Bloomington Monroe 13,818
4 47809 Terre Haute Vigo 10,051
5 46204 Indianapolis Marion 10,026
6 47901 Lafayette Tippecanoe 7,642
7 46796 Wolflake Noble 7,286
8 46224 Indianapolis Marion 5,626
9 47361 Mount Summit Henry 5,531
10 46201 Indianapolis Marion 5,433
11 47871 Riley Vigo 5,128
12 46556 Notre Dame St. Joseph 5,069
13 46807 Fort Wayne Allen 5,067
14 46324 Hammond Lake 4,910
15 46154 Maxwell Hancock 4,725
16 47405 Bloomington Monroe 4,721
17 46205 Indianapolis Marion 4,527
18 46615 South Bend St. Joseph 4,297
19 46616 South Bend St. Joseph 4,164
20 47714 Evansville Vanderburgh 4,001
21 46107 Beech Grove Marion 3,904
22 46617 South Bend St. Joseph 3,831
23 46613 South Bend St. Joseph 3,818
24 46235 Indianapolis Marion 3,791
25 46323 Hammond Lake 3,717
26 46202 Indianapolis Marion 3,684
27 46222 Indianapolis Marion 3,522
28 46047 Hobbs Tipton 3,500
29 47807 Terre Haute Vigo 3,470
30 46227 Indianapolis Marion 3,450
31 46322 Highland Lake 3,434
32 46260 Indianapolis Marion 3,429
33 46805 Fort Wayne Allen 3,344
34 46214 Indianapolis Marion 3,280
35 46208 Indianapolis Marion 3,245
36 46254 Indianapolis Marion 3,231
37 46806 Fort Wayne Allen 3,200
38 46226 Indianapolis Marion 3,182
39 46220 Indianapolis Marion 3,148
40 46321 Munster Lake 3,125
41 46320 Hammond Lake 3,082
42 46218 Indianapolis Marion 3,078
43 46219 Indianapolis Marion 2,979
44 46237 Indianapolis Marion 2,963
45 47925 Buffalo White 2,946
46 46038 Fishers Hamilton 2,820
47 47904 Lafayette Tippecanoe 2,820
48 46815 Fort Wayne Allen 2,818
49 46016 Anderson Madison 2,803
50 46203 Indianapolis Marion 2,709

Showing the top 50 of 807 ZIP codes in Indiana that have this figure . 47435 ranks 1st at 27,400, against 2,709 in 50th place.

Other rankings for Indiana

Cite this page

zipcodes.pro. “Most Densely Populated ZIP Codes in Indiana.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/in/highest-density

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