8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 43040 | Marysville | 38,990 |
| 43344 | Richwood | 6,173 |
| 43358 | West Mansfield | 2,275 |
| 43067 | Raymond | 1,884 |
| 43045 | Milford Center | 1,739 |
| 43036 | Magnetic Springs | 359 |
| 43077 | Unionville Center | 269 |
| 43007 | Broadway | 63 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Union County, Ohio (US Census).