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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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Mercer County ZIP Codes

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

County State ZIP Code City Area Codes
Mercer County NJ 08608 Trenton 215, 267, 445, 609, 640
Mercer County NJ 08609 Trenton 609, 640
Mercer County NJ 08610 Trenton 609, 640
Mercer County NJ 08611 Trenton 215, 267, 445, 609, 640
Mercer County NJ 08618 Trenton 215, 267, 445, 609, 640
Mercer County NJ 08619 Trenton 609, 640
Mercer County NJ 08620 Trenton 609, 640
Mercer County NJ 08625 Trenton 609
Mercer County NJ 08628 Trenton 215, 267, 445, 609, 640
Mercer County NJ 08629 Trenton 609, 640
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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.