Mt. Lebanon is a township with home rule status in Allegheny County, Pennsylvania, United States. The population was 33,137 at the 2010 census. It is a suburb of Pittsburgh.
Established in 1912 as Mount Lebanon, the township was a farming community until the arrival of streetcar lines, first opening in 1901 Now with the ability to commute to and from Downtown Pittsburgh daily, Mount Lebanon became a streetcar suburb, with the first real estate subdivision being laid out in November 1901. Further, the opening of the Liberty Tunnel in 1924 allowed easy automobile access to Pittsburgh. In 1975, the renamed Mt. Lebanon adopted one of the first home rule charters in Pennsylvania.
Source : Mt. Lebanon, Pennsylvania