Black Walnut zip code
Zip code in Black Walnut, MO
The location Black Walnut belongs to St. Charles County, state of Missouri. Black Walnut has been assigned with the zip code 63301.
The location name Black Walnut is listed as unacceptable by the US Postal Service so any mailing should avoid it. Instead you can use Saint Charles, the official name of the location.
| Zip code | Type | Population |
|---|---|---|
| 63301 | STANDARD | 42,750 |
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