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.

42,735 verified records

All states and U.S. territories

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State directory

Illinois ZIP Codes

Complete postal directory, details, and geographic map for the State of Illinois.

State	ZIP Code	City	County	Area Codes
IL	61425	Carman	Henderson County	`217, 309, 319, 447`
IL	61426	Castleton	Stark County	`309`
IL	61427	Cuba	Fulton County	`309`
IL	61428	Dahinda	Knox County	`309`
IL	61430	East Galesburg	Knox County	`309`
IL	61431	Ellisville	Fulton County	`309`
IL	61432	Fairview	Fulton County	`309`
IL	61433	Fiatt	Fulton County	`309`
IL	61434	Galva	Henry County	`309`
IL	61435	Gerlaw	Warren County	`309`

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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.