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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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Caroline County ZIP Codes

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

County State ZIP Code City Area Codes
Caroline County MD 21670 Templeville 410
Caroline County MD 21681 Ridgely 410
Caroline County MD 21682 Ridgely 410
Caroline County MD 21683 Ridgely 410
Caroline County MD 21684 Ridgely 410
Caroline County MD 21685 Ridgely 410
Caroline County MD 21686 Ridgely 410
Caroline County MD 21687 Ridgely 410
Caroline County MD 21688 Ridgely 410
Caroline County VA 22427 Bowling Green 804
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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.