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/LARGEST-AREA

Largest ZIP Codes in Illinois by Land Area

What this measures. Land area of the Census tabulation area, in square miles. Water is excluded. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 61944 Paris Edgar 262.76 sq mi
2 62448 Newton Jasper 205.00 sq mi
3 62650 Jacksonville Morgan 197.84 sq mi
4 62859 Mc Leansboro Hamilton 194.64 sq mi
5 62231 Carlyle Clinton 192.11 sq mi
6 61356 Princeton Bureau 189.63 sq mi
7 62353 Mount Sterling Brown 189.56 sq mi
8 62681 Rushville Schuyler 177.02 sq mi
9 62441 Marshall Clark 176.94 sq mi
10 62626 Carlinville Macoupin 170.90 sq mi
11 62821 Carmi White 170.55 sq mi
12 62938 Golconda Pope 168.77 sq mi
13 62321 Carthage Hancock 167.61 sq mi
14 61254 Geneseo Henry 166.49 sq mi
15 62837 Fairfield Wayne 163.93 sq mi
16 61455 Macomb McDonough 162.51 sq mi
17 60450 Morris Grundy 157.62 sq mi
18 61364 Streator LaSalle 157.33 sq mi
19 62450 Olney Richland 157.33 sq mi
20 62694 Winchester Scott 156.13 sq mi
21 61764 Pontiac Livingston 154.53 sq mi
22 62363 Pittsfield Pike 154.19 sq mi
23 61231 Aledo Mercer 153.48 sq mi
24 61350 Ottawa LaSalle 152.52 sq mi
25 61520 Canton Fulton 151.99 sq mi
26 60953 Milford Iroquois 151.98 sq mi
27 62858 Louisville Clay 151.70 sq mi
28 61270 Morrison Whiteside 150.98 sq mi
29 61021 Dixon Lee 150.06 sq mi
30 61032 Freeport Stephenson 148.68 sq mi
31 61920 Charleston Coles 148.35 sq mi
32 62439 Lawrenceville Lawrence 147.98 sq mi
33 62263 Nashville Washington 147.81 sq mi
34 62863 Mount Carmel Wabash 147.33 sq mi
35 62946 Harrisburg Saline 145.65 sq mi
36 62246 Greenville Bond 143.09 sq mi
37 62052 Jerseyville Jersey 143.08 sq mi
38 62298 Waterloo Monroe 143.04 sq mi
39 62959 Marion Williamson 143.03 sq mi
40 62864 Mount Vernon Jefferson 142.98 sq mi
41 62656 Lincoln Logan 142.84 sq mi
42 62274 Pinckneyville Perry 142.83 sq mi
43 61924 Chrisman Edgar 142.82 sq mi
44 61462 Monmouth Warren 142.19 sq mi
45 62442 Martinsville Clark 139.53 sq mi
46 62466 Sumner Lawrence 139.53 sq mi
47 62305 Quincy Adams 139.25 sq mi
48 62016 Carrollton Greene 135.27 sq mi
49 62801 Centralia Marion 134.44 sq mi
50 61277 Prophetstown Whiteside 133.69 sq mi

Showing the top 50 of 1,396 ZIP codes in Illinois that have this figure and meet the threshold above. 61944 ranks 1st at 262.76 sq mi, against 133.69 sq mi in 50th place.

Other rankings for Illinois

Cite this page

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

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