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Canonsburg is a borough in Washington County , Pennsylvania , 18 miles (29 km) southwest of Pittsburgh . Canonsburg was laid out by Colonel John Canon in 1789 and incorporated in 1802 . It was the central point of the Whiskey Rebellion of 1794 . The borough is in a rich coal district, and most of the town's work force once worked in local steel mills or coal mines . Canonsburg's population in 1910 , including South Canonsburg, which was annexed in 1911 , was 5,588; in 1920 it was 10,632; and in 1940 it was 12,599. The population was 8,607 at the 2000 census. Interstate 79 passes through the town, as well as several railroad lines. A trolley used to operate from Washington, Pennsylvania to Pittsburgh through Canonsburg until 1953. Canonsburg was home to singers Perry Como and Bobby Vinton , NFL head coach Marty Schottenheimer , Olympic gold medalist Kurt Angle , and Theodosius Lazor, Metropolitan Bishop for the Orthodox Church in America . Jonathan Letterman , the "Father of Battlefield Medicine" during the Civil War, was also born in Canonsburg. The town was the birthplace of the members of the vocal group, The Four Coins , popular in the 1950s and 60s . The town is the headquarters for Centimark , Mylan Laboratories , All-Clad Metalcrafters , Sarris Candies , and the Black Box Corporation . It is also the site of the Southpointe office park , where a branch of the California University of Pennsylvania is located. Yenko Chevrolet , one of largest and most notorious custom muscle car shops of the late 1960s and early 1970s , was also located in Canonsburg. Canonsburg is home to an annual Oktoberfest and the second-largest Independence Day parade in the state of Pennsylvania, second only to Philadelphia . In the weeks leading up to the parade, the town frequently gains media attention for its residents setting up folding chairs along the town's main street to stake claim to prime viewing areas. The borough is served by the Canon-McMillan School District .