Ohio ZIP codes
Ohio holds 1,416 ZIP codes between 43001 and 45999. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Ohio
| Place | ZIP codes |
|---|---|
| Cincinnati | 71 |
| Columbus | 45 |
| Dayton | 43 |
| Cleveland | 40 |
| Toledo | 32 |
| Akron | 27 |
| Canton | 18 |
| Youngstown | 15 |
| Mansfield | 7 |
| Lima | 6 |
| Springfield | 6 |
| Warren | 6 |
| Hamilton | 4 |
| Euclid | 3 |
| Westerville | 3 |
| Groveport | 3 |
| Newark | 3 |
| Lorain | 3 |
| Kent | 3 |
| Massillon | 3 |
Ohio counties by ZIP count
| County | ZIP codes |
|---|---|
| Hamilton | 78 |
| Franklin | 63 |
| Cuyahoga | 62 |
| Montgomery | 51 |
| Summit | 48 |
| Lucas | 42 |
| Stark | 42 |
| Mahoning | 32 |
| Wood | 30 |
| Trumbull | 28 |
Reading a Ohio ZIP code
Ohio holds 1,416 ZIP codes between 43001 and 45999, spread over 88 counties. Cincinnati leads the state with 71 codes, ahead of Columbus with 45. Every code here opens with the digit 4: that opening number is the national postal region Ohio belongs to, the next two digits name the sectional center that sorts the mail, and the final two point to the local office. A ZIP+4 suffix narrows delivery to a block face. Boundaries follow carrier routes rather than city limits, which is why Cincinnati spreads across 71 codes while some rural codes cross county lines.
Source: GeoNames postal dataset (CC BY 4.0), snapshot of 2026-07-09. Counts cover standard delivery ZIPs listed for Ohio; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources