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

Indiana ZIP Codes

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

State ZIP Code City County Area Codes
IN 46301 Beverly Shores Porter County 219
IN 46302 Boone Grove Porter County 219
IN 46303 Cedar Lake Lake County 219, 464, 708
IN 46304 Chesterton Porter County 219
IN 46307 Crown Point Lake County 219
IN 46308 Crown Point Lake County 219
IN 46310 Demotte Jasper County 219
IN 46311 Dyer Lake County 219, 464, 708
IN 46312 East Chicago Lake County 219
IN 46319 Griffith Lake County 219
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Geographic Map of Indiana

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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.