12 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 45040 | Mason | 58,132 |
| 45036 | Lebanon | 43,262 |
| 45005 | Franklin | 31,906 |
| 45039 | Maineville | 28,958 |
| 45066 | Springboro | 26,663 |
| 45152 | Morrow | 13,577 |
| 45068 | Waynesville | 11,606 |
| 45065 | South Lebanon | 6,938 |
| 45054 | Oregonia | 2,549 |
| 45162 | Pleasant Plain | 2,348 |
| 45034 | Kings Mills | 1,080 |
| 45032 | Harveysburg | 627 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 12 ZCTAs in Warren County, Ohio (US Census).