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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 PA 16113 Clark 724, 878
Mercer County PA 16114 Clarks Mills 582, 724, 814, 878
Mercer County PA 16121 Farrell 234, 330, 724, 878
Mercer County PA 16124 Fredonia 724, 878
Mercer County PA 16125 Greenville 234, 330, 582, 724, 814, 878
Mercer County PA 16127 Grove City 582, 724, 814, 878
Mercer County PA 16130 Hadley 582, 724, 814, 878
Mercer County PA 16133 Jackson Center 582, 724, 814, 878
Mercer County PA 16137 Mercer 582, 724, 814, 878
Mercer County PA 16145 Sandy Lake 582, 724, 814, 878
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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.