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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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Hancock County ZIP Codes

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

County State ZIP Code City Area Codes
Hancock County IL 62311 Augusta 217, 309, 447
Hancock County IL 62313 Basco 217, 447
Hancock County IL 62316 Bowen 217, 309, 447
Hancock County IL 62321 Carthage 217, 447
Hancock County IL 62329 Colusa 217, 447
Hancock County IL 62330 Dallas City 217, 309, 319, 447
Hancock County IL 62334 Elvaston 217, 447
Hancock County IL 62336 Ferris 217, 447
Hancock County IL 62341 Hamilton 217, 319, 447
Hancock County IL 62354 Nauvoo 217, 319, 447
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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.