| Zip Code | City | Population ↓ |
|---|---|---|
| 54956 | Neenah | 46,567 |
| 54901 | Oshkosh | 37,294 |
| 54904 | Oshkosh | 22,273 |
| 54902 | Oshkosh | 22,243 |
| 54963 | Omro | 7,271 |
| 54986 | Winneconne | 5,394 |
| 54947 | Larsen | 2,323 |
| 54964 | Pickett | 974 |
| 54927 | Butte Des Morts | 540 |
| 54985 | Winnebago | 249 |
| 54980 | Waukau | 218 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 11 ZCTAs in Winnebago County, Wisconsin (US Census).