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is a borough in Butler County, Pennsylvania, United States. The population was 3,068 at the 2000 census. It is home to the Slippery Rock University of Pennsylvania. It is also known as "Slimy Pebble." The town of Slippery Rock was formerly called Centreville, but it was changed in the early 1890s because George Washington's troops slipped in the creek attempting to capture the local Indians.
According to the United States Census Bureau, the borough has a total area of 1.7 square miles (4.4 km²), all of it land. Since the 1960s Slippery Rock has been well served by the Interstate Highway system as Interstate 79 (North-South) and Interstate 80 (East-West) cross roughly 10 miles away. The terrain is hilly and the strip mining of coal has been a prominent commercial activity in the surrounding area, which is largely agricultural.