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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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Warren County ZIP Codes

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

County State ZIP Code City Area Codes
Warren County IL 61423 Cameron 309
Warren County IL 61435 Gerlaw 309
Warren County IL 61447 Kirkwood 309
Warren County IL 61453 Little York 309
Warren County IL 61462 Monmouth 309
Warren County IL 61473 Roseville 309
Warren County IL 61478 Smithshire 309
Warren County IN 47975 Pine Village 765
Warren County IN 47982 State Line 217, 447, 765
Warren County IN 47991 West Lebanon 217, 447, 765
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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.