| Zip Code | City | Population ↓ |
|---|---|---|
| 45424 | Dayton | 50,221 |
| 45458 | Dayton | 37,128 |
| 45342 | Miamisburg | 36,127 |
| 45459 | Dayton | 28,509 |
| 45417 | Dayton | 28,029 |
| 45429 | Dayton | 26,523 |
| 45420 | Dayton | 23,600 |
| 45322 | Englewood | 21,540 |
| 45414 | Dayton | 20,423 |
| 45406 | Dayton | 19,954 |
| 45405 | Dayton | 19,059 |
| 45449 | Dayton | 19,032 |
| 45410 | Dayton | 17,345 |
| 45419 | Dayton | 16,852 |
| 45409 | Dayton | 15,788 |
| 45377 | Vandalia | 14,272 |
| 45426 | Dayton | 13,591 |
| 45403 | Dayton | 13,002 |
| 45415 | Dayton | 12,601 |
| 45439 | Dayton | 12,591 |
| 45309 | Brookville | 11,789 |
| 45402 | Dayton | 10,438 |
| 45404 | Dayton | 10,380 |
| 45327 | Germantown | 8,916 |
| 45345 | New Lebanon | 6,553 |
| 45416 | Dayton | 5,547 |
| 45315 | Clayton | 4,402 |
| 45325 | Farmersville | 2,473 |
| 45354 | Phillipsburg | 632 |
| 45428 | Dayton | 286 |
| 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).