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/IL/MOST-TAX-RETURNS

ZIP Codes With the Most Tax Returns Filed in Illinois

What this measures. Number of individual income tax returns filed. A rough proxy for how many households a ZIP code contains, available where census figures are not. Source: IRS Statistics of Income, ZIP code data, data release 2026-10-12.

# ZIP City County Returns filed
1 60629 Chicago Cook 48,150
2 60618 Chicago Cook 43,000
3 60647 Chicago Cook 42,860
4 60657 Chicago Cook 40,570
5 60634 Chicago Cook 37,640
6 60639 Chicago Cook 37,020
7 60632 Chicago Cook 36,120
8 60614 Chicago Cook 35,960
9 60625 Chicago Cook 35,310
10 60640 Chicago Cook 34,930
11 60804 Cicero Cook 33,700
12 60641 Chicago Cook 32,690
13 60617 Chicago Cook 32,590
14 60016 Des Plaines Cook 31,350
15 60085 Waukegan Lake 30,550
16 60608 Chicago Cook 29,630
17 60623 Chicago Cook 29,350
18 60402 Berwyn Cook 29,320
19 60073 Round Lake Lake 29,070
20 60613 Chicago Cook 29,060
21 60453 Oak Lawn Cook 29,040
22 60620 Chicago Cook 28,270
23 60622 Chicago Cook 28,250
24 60056 Mount Prospect Cook 28,180
25 60638 Chicago Cook 27,590
26 60628 Chicago Cook 27,130
27 60630 Chicago Cook 26,780
28 60148 Lombard DuPage 26,660
29 60619 Chicago Cook 26,330
30 60004 Arlington Heights Cook 26,320
31 60440 Bolingbrook Will 25,660
32 60651 Chicago Cook 25,650
33 60505 Aurora Kane 25,300
34 60506 Aurora Kane 24,910
35 60610 Chicago Cook 24,860
36 60014 Crystal Lake McHenry 24,440
37 60120 Elgin Cook 24,080
38 60411 Chicago Heights Cook 24,010
39 60435 Joliet Will 23,880
40 60616 Chicago Cook 23,760
41 60609 Chicago Cook 23,560
42 60586 Plainfield Will 23,510
43 60123 Elgin Kane 23,280
44 60643 Chicago Cook 23,020
45 60126 Elmhurst DuPage 22,930
46 60010 Barrington Cook 22,670
47 60626 Chicago Cook 22,190
48 60062 Northbrook Cook 22,140
49 61265 Moline Rock Island 21,470
50 60089 Buffalo Grove Lake 21,250

Showing the top 50 of 1,228 ZIP codes in Illinois that have this figure . 60629 ranks 1st at 48,150, against 21,250 in 50th place.

Other rankings for Illinois

Cite this page

zipcodes.pro. “ZIP Codes With the Most Tax Returns Filed in Illinois.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/il/most-tax-returns

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