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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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Massac County ZIP Codes

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

County State ZIP Code City Area Codes
Massac County IL 62908 Belknap 618
Massac County IL 62910 Brookport 270, 364, 618
Massac County IL 62953 Joppa 270, 364, 618
Massac County IL 62960 Metropolis 270, 364, 618

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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.