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Sewickley is a borough in Allegheny County, Pennsylvania, United States, 12 miles (19 km) west northwest of Pittsburgh along the Ohio River. It is a residential suburb of the Pittsburgh metropolitan area. The population was 3,907 at the 2020 census. The Sewickley Bridge crosses the Ohio River from Sewickley to Moon Township. == Etymology == Historian Charles A. Hanna suggested "Sewickley" came from Creek words for "raccoon" (sawi) and "town" (ukli).