There are 5 zip codes in Oregon County, Missouri. The most populated is 65791, located in Thayer. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
657914,234Thayer
656062,431Alton
65692983Koshkonong
65778485Myrtle
65690131Couch
showing: 5 rows

Zip Codes in Oregon County, Missouri by Population (2024)