| Zip Code | City | Population ↓ |
|---|---|---|
| 45805 | Lima | 24,387 |
| 45801 | Lima | 21,739 |
| 45804 | Lima | 13,608 |
| 45807 | Lima | 11,774 |
| 45806 | Lima | 10,974 |
| 45833 | Delphos | 10,919 |
| 45817 | Bluffton | 5,926 |
| 45887 | Spencerville | 4,422 |
| 45850 | Harrod | 3,559 |
| 45820 | Cairo | 581 |
| 45808 | Beaverdam | 350 |
| 45854 | Lafayette | 293 |
| 45809 | Gomer | 45 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 13 ZCTAs in Allen County, Ohio (US Census).