Keystone zip code
Zip code in Keystone, IA
The location Keystone belongs to Benton County, state of Iowa. Keystone has been assigned with the zip code 52249.
Keystone is the official name of the location so if you want to use the US Postal Service you must use that name.
| Zip code | Type | Population |
|---|---|---|
| 52249 | STANDARD | 850 |
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