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/OH/LARGEST-AREA

Largest ZIP Codes in Ohio 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 45601 Chillicothe Ross 348.73 sq mi
2 45133 Hillsboro Highland 314.46 sq mi
3 43140 London Madison 219.85 sq mi
4 43512 Defiance Defiance 217.68 sq mi
5 43160 Washington Court House Fayette 213.25 sq mi
6 45660 Peebles Adams 202.65 sq mi
7 43302 Marion Marion 194.97 sq mi
8 45895 Wapakoneta Auglaize 187.00 sq mi
9 43326 Kenton Hardin 186.49 sq mi
10 43701 Zanesville Muskingum 180.51 sq mi
11 43138 Logan Hocking 175.81 sq mi
12 45640 Jackson Jackson 174.61 sq mi
13 45177 Wilmington Clinton 169.95 sq mi
14 45840 Findlay Hancock 166.49 sq mi
15 43040 Marysville Union 166.27 sq mi
16 44883 Tiffin Seneca 164.88 sq mi
17 43130 Lancaster Fairfield 164.52 sq mi
18 45822 Celina Mercer 162.95 sq mi
19 43113 Circleville Pickaway 162.19 sq mi
20 43907 Cadiz Harrison 161.05 sq mi
21 44820 Bucyrus Crawford 160.59 sq mi
22 44654 Millersburg Holmes 160.17 sq mi
23 43812 Coshocton Coshocton 156.98 sq mi
24 45365 Sidney Shelby 155.72 sq mi
25 43724 Caldwell Noble 155.46 sq mi
26 44691 Wooster Wayne 154.90 sq mi
27 43050 Mount Vernon Knox 154.05 sq mi
28 43351 Upper Sandusky Wyandot 154.00 sq mi
29 45331 Greenville Darke 151.18 sq mi
30 44805 Ashland Ashland 151.09 sq mi
31 43078 Urbana Champaign 150.39 sq mi
32 45701 Athens Athens 148.59 sq mi
33 44615 Carrollton Carroll 143.97 sq mi
34 45651 Mc Arthur Vinton 141.94 sq mi
35 45690 Waverly Pike 141.46 sq mi
36 45648 Lucasville Scioto 139.46 sq mi
37 43756 Mcconnelsville Morgan 138.45 sq mi
38 45385 Xenia Greene 137.25 sq mi
39 43420 Fremont Sandusky 136.32 sq mi
40 43545 Napoleon Henry 135.01 sq mi
41 45891 Van Wert Van Wert 134.26 sq mi
42 45320 Eaton Preble 134.01 sq mi
43 45656 Oak Hill Jackson 133.82 sq mi
44 43143 Mount Sterling Madison 133.64 sq mi
45 45693 West Union Adams 132.36 sq mi
46 44256 Medina Medina 130.77 sq mi
47 43015 Delaware Delaware 127.93 sq mi
48 43725 Cambridge Guernsey 124.17 sq mi
49 43844 Warsaw Coshocton 123.97 sq mi
50 44830 Fostoria Seneca 118.43 sq mi

Showing the top 50 of 1,233 ZIP codes in Ohio that have this figure and meet the threshold above. 45601 ranks 1st at 348.73 sq mi, against 118.43 sq mi in 50th place.

Other rankings for Ohio

Cite this page

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

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