32 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 45424 | Dayton | 49,871 |
| 45458 | Dayton | 37,413 |
| 45342 | Miamisburg | 36,675 |
| 45459 | Dayton | 28,454 |
| 45417 | Dayton | 28,161 |
| 45429 | Dayton | 26,510 |
| 45420 | Dayton | 23,956 |
| 45322 | Englewood | 20,978 |
| 45414 | Dayton | 20,479 |
| 45406 | Dayton | 20,261 |
| 45405 | Dayton | 19,322 |
| 45449 | Dayton | 18,627 |
| 45419 | Dayton | 16,583 |
| 45409 | Dayton | 15,677 |
| 45410 | Dayton | 15,617 |
| 45377 | Vandalia | 14,972 |
| 45403 | Dayton | 13,831 |
| 45426 | Dayton | 13,582 |
| 45439 | Dayton | 12,246 |
| 45415 | Dayton | 12,171 |
| 45309 | Brookville | 11,905 |
| 45404 | Dayton | 10,762 |
| 45402 | Dayton | 9,964 |
| 45327 | Germantown | 8,949 |
| 45345 | New Lebanon | 5,923 |
| 45416 | Dayton | 5,353 |
| 45315 | Clayton | 4,804 |
| 45325 | Farmersville | 2,746 |
| 45354 | Phillipsburg | 643 |
| 45428 | Dayton | 274 |
| 45469 | Dayton | 206 |
| 45423 | Dayton | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 32 ZCTAs in Montgomery County, Ohio (US Census).