| Post Office | Mequon |
| Division | Ozaukee |
| Pincode | 53092 |
| Post Office | Cedarburg |
| Division | Ozaukee |
| Pincode | 53012 |
| Post Office | Grafton |
| Division | Ozaukee |
| Pincode | 53024 |
| Post Office | Port Washington |
| Division | Ozaukee |
| Pincode | 53074 |
| Post Office | Mequon |
| Division | Ozaukee |
| Pincode | 53097 |
| Post Office | Saukville |
| Division | Ozaukee |
| Pincode | 53080 |