| Zip Code | City | Population ↓ |
|---|---|---|
| 48867 | Owosso | 27,500 |
| 48848 | Laingsburg | 8,344 |
| 48429 | Durand | 8,241 |
| 48872 | Perry | 6,142 |
| 48817 | Corunna | 5,416 |
| 48418 | Byron | 4,484 |
| 48857 | Morrice | 3,206 |
| 48449 | Lennon | 2,744 |
| 48460 | New Lothrop | 2,701 |
| 48414 | Bancroft | 2,488 |
| 48841 | Henderson | 729 |
| 48476 | Vernon | 689 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 12 ZCTAs in Shiawassee County, Michigan (US Census).