Mason City zip code
Zip code in Mason City, WA
The location Mason City belongs to Douglas County, state of Washington. Mason City has been assigned with the zip code 99116.
The location name Mason City is listed as unacceptable by the US Postal Service so any mailing should avoid it. Instead you can use Coulee Dam, the official name of the location.
| Zip code | Type | Population |
|---|---|---|
| 99116 | STANDARD | 1,190 |
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