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-POPULATION

ZIP Codes With the Largest Population in Ohio

What this measures. Population of the Census tabulation area, ACS 5-year estimate. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Population
1 45011 Hamilton Butler 75,864
2 43123 Grove City Franklin 67,626
3 43026 Hilliard Franklin 65,238
4 43081 Westerville Franklin 65,020
5 44256 Medina Medina 64,924
6 43055 Newark Licking 63,281
7 43130 Lancaster Fairfield 62,933
8 44035 Elyria Lorain 62,179
9 43015 Delaware Delaware 61,401
10 44060 Mentor Lake 60,779
11 43068 Reynoldsburg Franklin 60,148
12 45040 Mason Warren 59,518
13 43228 Columbus Franklin 59,077
14 43230 Columbus Franklin 58,076
15 44077 Painesville Lake 57,325
16 45140 Loveland Clermont 57,211
17 43701 Zanesville Muskingum 56,402
18 45044 Middletown Butler 56,217
19 45069 West Chester Butler 56,037
20 45601 Chillicothe Ross 55,836
21 43229 Columbus Franklin 55,020
22 45840 Findlay Hancock 54,559
23 45013 Hamilton Butler 53,998
24 43302 Marion Marion 53,702
25 45424 Dayton Montgomery 50,725
26 44107 Lakewood Cuyahoga 50,018
27 44130 Cleveland Cuyahoga 49,679
28 45238 Cincinnati Hamilton 48,351
29 44646 Massillon Stark 47,741
30 43232 Columbus Franklin 47,364
31 43207 Columbus Franklin 47,272
32 43147 Pickerington Fairfield 46,963
33 43065 Powell Delaware 46,679
34 43016 Dublin Franklin 46,362
35 44212 Brunswick Medina 45,889
36 45014 Fairfield Butler 45,773
37 43235 Columbus Franklin 44,589
38 44691 Wooster Wayne 44,344
39 43224 Columbus Franklin 44,319
40 43551 Perrysburg Wood 43,770
41 43110 Canal Winchester Fairfield 43,544
42 43204 Columbus Franklin 42,962
43 45036 Lebanon Warren 42,204
44 44111 Cleveland Cuyahoga 42,021
45 43017 Dublin Franklin 41,613
46 45324 Fairborn Greene 41,194
47 44118 Cleveland Cuyahoga 40,715
48 45385 Xenia Greene 40,617
49 45231 Cincinnati Hamilton 40,463
50 43615 Toledo Lucas 40,146

Showing the top 50 of 1,233 ZIP codes in Ohio that have this figure . 45011 ranks 1st at 75,864, against 40,146 in 50th place.

Other rankings for Ohio

Cite this page

zipcodes.pro. “ZIP Codes With the Largest Population in Ohio.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/oh/largest-population

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