32 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 45424 | Dayton | 50,725 |
| 45458 | Dayton | 38,712 |
| 45342 | Miamisburg | 36,152 |
| 45459 | Dayton | 28,553 |
| 45417 | Dayton | 28,186 |
| 45429 | Dayton | 26,347 |
| 45420 | Dayton | 24,411 |
| 45414 | Dayton | 21,167 |
| 45322 | Englewood | 20,884 |
| 45406 | Dayton | 19,991 |
| 45449 | Dayton | 19,066 |
| 45405 | Dayton | 18,955 |
| 45419 | Dayton | 17,008 |
| 45409 | Dayton | 15,293 |
| 45377 | Vandalia | 14,888 |
| 45410 | Dayton | 14,694 |
| 45426 | Dayton | 14,114 |
| 45403 | Dayton | 13,608 |
| 45415 | Dayton | 12,465 |
| 45439 | Dayton | 11,914 |
| 45309 | Brookville | 11,876 |
| 45404 | Dayton | 9,826 |
| 45402 | Dayton | 9,407 |
| 45327 | Germantown | 9,315 |
| 45345 | New Lebanon | 6,110 |
| 45416 | Dayton | 5,640 |
| 45315 | Clayton | 4,905 |
| 45325 | Farmersville | 2,470 |
| 45354 | Phillipsburg | 553 |
| 45428 | Dayton | 272 |
| 45469 | Dayton | 168 |
| 45423 | Dayton | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 32 ZCTAs in Montgomery County, Ohio (US Census).