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/HIGHEST-DENSITY

Most Densely Populated ZIP Codes in Ohio

What this measures. People per square mile of land area. Source: Census American Community Survey and Gazetteer, data release 2026-10-12.

# ZIP City County People per sq mi
1 45119 Feesburg Brown 16,615
2 43403 Bowling Green Wood 14,269
3 45219 Cincinnati Hamilton 12,610
4 44243 Kent Portage 12,014
5 43201 Columbus Franklin 11,235
6 45469 Dayton Montgomery 9,333
7 44107 Lakewood Cuyahoga 9,297
8 43202 Columbus Franklin 8,295
9 43210 Columbus Franklin 8,186
10 44703 Canton Stark 7,628
11 44101 Cleveland Cuyahoga 7,400
12 43206 Columbus Franklin 7,286
13 44123 Euclid Cuyahoga 7,129
14 45202 Cincinnati Hamilton 6,708
15 45205 Cincinnati Hamilton 6,666
16 44102 Cleveland Cuyahoga 6,561
17 44111 Cleveland Cuyahoga 6,417
18 44120 Cleveland Cuyahoga 6,340
19 43212 Columbus Franklin 6,261
20 43227 Columbus Franklin 6,112
21 45410 Dayton Montgomery 6,105
22 44302 Akron Summit 6,089
23 43229 Columbus Franklin 6,088
24 43203 Columbus Franklin 5,981
25 44119 Cleveland Cuyahoga 5,963
26 45207 Cincinnati Hamilton 5,878
27 45212 Cincinnati Hamilton 5,872
28 44106 Cleveland Cuyahoga 5,845
29 44118 Cleveland Cuyahoga 5,776
30 44109 Cleveland Cuyahoga 5,558
31 43231 Columbus Franklin 5,534
32 43224 Columbus Franklin 5,364
33 44113 Cleveland Cuyahoga 5,287
34 43205 Columbus Franklin 5,280
35 44121 Cleveland Cuyahoga 5,081
36 45699 Lucasville Scioto 5,079
37 45206 Cincinnati Hamilton 5,049
38 43613 Toledo Lucas 5,025
39 45229 Cincinnati Hamilton 4,947
40 44129 Cleveland Cuyahoga 4,929
41 45220 Cincinnati Hamilton 4,877
42 43434 Harbor View Lucas 4,783
43 45405 Dayton Montgomery 4,777
44 43211 Columbus Franklin 4,734
45 45239 Cincinnati Hamilton 4,733
46 44115 Cleveland Cuyahoga 4,731
47 45238 Cincinnati Hamilton 4,697
48 45209 Cincinnati Hamilton 4,665
49 43209 Columbus Franklin 4,606
50 43204 Columbus Franklin 4,593

Showing the top 50 of 1,233 ZIP codes in Ohio that have this figure . 45119 ranks 1st at 16,615, against 4,593 in 50th place.

Other rankings for Ohio

Cite this page

zipcodes.pro. “Most Densely Populated ZIP Codes in Ohio.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/oh/highest-density

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