Portland zip code
Zip code in Portland, IL
The location Portland belongs to Whiteside County, state of Illinois. Portland has been assigned with the zip code 61277.
The location name Portland is listed as unacceptable by the US Postal Service so any mailing should avoid it. Instead you can use Prophetstown, the official name of the location.
| Zip code | Type | Population |
|---|---|---|
| 61277 | STANDARD | 2,850 |
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