Philadelphia Main Line

For other uses, see Mainline.

"Pennsylvania Main Line" redirects here. For other uses, see Pennsylvania Line (disambiguation).

For the Pennsylvania Railroad line, see Main Line (Pennsylvania Railroad).

Main Line of Philadelphia Main Line, Philadelphia Main Line
Collection of suburban communities
Map of the historic Philadelphia Main Line, c. 1895
Location of Pennsylvania in the United States
Coordinates: 40.019°N 75.313°W / 40.019; -75.313
Country	United States
State	Pennsylvania
County	Primarily Montgomery and Chester counties; certain northern parts of Delaware County
Named for	The Pennsylvania Railroad's Main Line
Demonym	Main Liner
Time zone	UTC−5 (EST)
• Summer (DST)	UTC−4 (EDT)
Area codes	215, 267, 445, 610, and 484

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La Ronda Estate (1929–2009) in Bryn Mawr, by architect Addison Mizner)

The Philadelphia Main Line, known simply as the Main Line, is an informally delineated historical and social region of suburban Philadelphia, Pennsylvania. Lying along the former Pennsylvania Railroad's once prestigious Main Line, it runs northwest from Center City Philadelphia parallel to Philadelphia and Lancaster Turnpike, also known as U.S. Route 30.

The railroad first connected the Main Line towns in the 19th century. They became home to sprawling country estates belonging to Philadelphia's wealthiest families, and over the decades became a bastion of "old money". The Main Line includes some of the wealthiest communities in the country, Villanova, Radnor, Haverford, and Merion. Today, the railroad is Amtrak's Keystone Corridor, along which SEPTA's Paoli/Thorndale Line operates.