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. The population was 8,992 at the 2010 census.
The town is in a rich coal district, and most of the town's work force once worked in local steel mills or coal mines. Interstate 79 and U.S. Route 19 pass through the town, as does the Pittsburgh and Ohio Central Railroad. A trolley used to operate from Washington, Pennsylvania to Pittsburgh through the borough until 1953.
The town is home to Sarris Candies and All-Clad Metalcrafters, makers of cookware and other bonded metals. It is adjacent to the Southpointe office park located in Cecil Township, which has a number of large corporate tenants. 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 the Pittsburgh Cougars junior hockey league team.