U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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Oregon County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Oregon County.

County State ZIP Code City Area Codes
Oregon County MO 65606 Alton 417, 573
Oregon County MO 65690 Couch 417
Oregon County MO 65692 Koshkonong 417, 870
Oregon County MO 65778 Myrtle 417, 870
Oregon County MO 65791 Thayer 417, 870

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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.