| Zip Code | City | Population ↓ |
|---|---|---|
| 43040 | Marysville | 36,678 |
| 43344 | Richwood | 6,119 |
| 43358 | West Mansfield | 2,608 |
| 43045 | Milford Center | 1,775 |
| 43067 | Raymond | 1,360 |
| 43036 | Magnetic Springs | 306 |
| 43077 | Unionville Center | 277 |
| 43007 | Broadway | 43 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Union County, Ohio (US Census).