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/SMALLEST-AREA

Smallest ZIP Codes in Illinois by Land Area

What this measures. Land area of the Census tabulation area, smallest first. These are almost always dense urban ZIP codes covering a few city blocks. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 61331 Lee Center Lee 0.03 sq mi
2 61562 Rome Peoria 0.04 sq mi
3 60144 Kaneville Kane 0.05 sq mi
4 62706 Springfield Sangamon 0.05 sq mi
5 60519 Eola DuPage 0.05 sq mi
6 61625 Peoria Peoria 0.06 sq mi
7 60604 Chicago Cook 0.08 sq mi
8 60602 Chicago Cook 0.08 sq mi
9 61402 Galesburg Knox 0.08 sq mi
10 60113 Creston Ogle 0.10 sq mi
11 61471 Raritan Henderson 0.10 sq mi
12 61750 Lane De Witt 0.10 sq mi
13 62030 Fidelity Jersey 0.10 sq mi
14 62852 Keensburg Wabash 0.11 sq mi
15 60603 Chicago Cook 0.12 sq mi
16 62256 Maeystown Monroe 0.12 sq mi
17 62879 Sailor Springs Clay 0.12 sq mi
18 61323 Dover Bureau 0.13 sq mi
19 60536 Millbrook Kendall 0.13 sq mi
20 61037 Galt Whiteside 0.14 sq mi
21 61371 Triumph LaSalle 0.15 sq mi
22 62861 Maunie White 0.16 sq mi
23 62336 Ferris Hancock 0.16 sq mi
24 60075 Russell Lake 0.16 sq mi
25 61541 La Rose Marshall 0.16 sq mi
26 60301 Oak Park Cook 0.20 sq mi
27 61324 Eldena Lee 0.21 sq mi
28 60956 Papineau Iroquois 0.21 sq mi
29 60208 Evanston Cook 0.21 sq mi
30 61815 Bondville Champaign 0.23 sq mi
31 60606 Chicago Cook 0.23 sq mi
32 61524 Dunfermline Fulton 0.25 sq mi
33 62248 Hecker Monroe 0.25 sq mi
34 60969 Union Hill Kankakee 0.26 sq mi
35 62841 Freeman Spur Williamson 0.30 sq mi
36 60661 Chicago Cook 0.31 sq mi
37 62915 Cambria Williamson 0.32 sq mi
38 60932 East Lynn Vermilion 0.33 sq mi
39 61276 Preemption Mercer 0.34 sq mi
40 60165 Stone Park Cook 0.34 sq mi
41 62961 Millcreek Union 0.34 sq mi
42 61258 Hooppole Henry 0.37 sq mi
43 61563 Saint David Fulton 0.38 sq mi
44 60601 Chicago Cook 0.39 sq mi
45 62701 Springfield Sangamon 0.39 sq mi
46 61955 Vermilion Edgar 0.39 sq mi
47 60141 Hines Cook 0.42 sq mi
48 62523 Decatur Macon 0.45 sq mi
49 60029 Golf Cook 0.45 sq mi
50 61013 Cedarville Stephenson 0.47 sq mi

Showing the top 50 of 1,396 ZIP codes in Illinois that have this figure and meet the threshold above. 61331 ranks 1st at 0.03 sq mi, against 0.47 sq mi in 50th place.

Other rankings for Illinois

Cite this page

zipcodes.pro. “Smallest ZIP Codes in Illinois by Land Area.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/il/smallest-area

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