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is a borough in Mercer County, Pennsylvania, United States. The population was 2,391 at the 2000 census. It is the county seat of Mercer County. Mercer is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.
The community was named after physician Brigadier General Hugh Mercer. Brigadier General Mercer was a close friend to General Washington and became a rallying point for the Battle of Princeton.
Mercer is the birthplace of the 19th century painter Samuel Waugh, as well as musician Trent Reznor, creator of the band Nine Inch Nails. It is also known for electing one of the nation's youngest mayors, Christopher Portman, who was just 18 when he ran for office and 19 in January, 2002 when he was sworn in (he would resign before the end of his first term). Mercer is also known for its great Memorial Day Parade with the main street lined with 500 flags. Each February it holds Penn's Woods West Arts & Crafts Festival at the Mercer Area High School as well Victorian Days in the summer. Many attend the outstanding concerts by the Mercer Community Band on Friday evenings each summer.
According to the United States Census Bureau, the borough has a total area of 1.2 square miles (3.2 km²), all of it land.