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U.S. ZIP Codes Database 2026

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Morrow County ZIP Codes

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

County State ZIP Code City Area Codes
Morrow County OR 97836 Heppner 458, 541
Morrow County OR 97839 Lexington 458, 541
Morrow County OR 97843 Ione 458, 541
Morrow County OR 97844 Irrigon 458, 509, 541
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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.