| ZIP Code | ZIP Code Place Name | County | ZIP Code Type |
|---|---|---|---|
| 50005 | Albion | Marshall County | Standard |
| 50051 | Clemons | Marshall County | Standard |
| 50055 | Collins | Story County | Standard |
| 50078 | Ferguson | Marshall County | PO Box |
| 50106 | Gilman | Marshall County | Standard |
| 50120 | Haverhill | Marshall County | Standard |
| 50141 | Laurel | Marshall County | Standard |
| 50142 | Le Grand | Marshall County | PO Box |
| 50148 | Liscomb | Marshall County | Standard |
| 50158 | Marshalltown | Marshall County | Standard |
| 50162 | Melbourne | Marshall County | Standard |
| 50206 | New Providence | Hardin County | Standard |
| 50234 | Rhodes | Marshall County | Standard |
| 50239 | Saint Anthony | Marshall County | Standard |
| 50247 | State Center | Marshall County | Standard |
| 50258 | Union | Hardin County | Standard |
| 50609 | Beaman | Grundy County | Standard |
| 50621 | Conrad | Grundy County | Standard |
| 50632 | Garwin | Tama County | Standard |
| 50635 | Gladbrook | Tama County | Standard |