28 U.S.C. § 118

Pennsylvania is divided into three judicial districts to be known as the Eastern, Middle, and Western Districts of Pennsylvania. Eastern District (a) The Eastern District comprises the counties of Berks, Bucks, Chester, Delaware, Lancaster, Lehigh, Montgomery, Northampton, and Philadelphia. Court for the Eastern District shall be held at Allentown, Easton, Lancaster, Reading, and Philadelphia. Middle District (b) The Middle District comprises the counties of Adams, Bradford, Cameron, Carbon, Centre, Clinton, Columbia, Cumberland, Dauphin, Franklin, Fulton, Huntingdon, Juniata, Lackawanna, Lebanon, Luzerne, Lycoming, Mifflin, Monroe, Montour, Northumberland, Perry, Pike, Potter, Schuylkill, Snyder, Sullivan, Susquehanna, Tioga, Union, Wayne, Wyoming, and York. Court for the Middle District shall be held at Harrisburg, Lewisburg, Scranton, Wilkes-Barre, and Williamsport. Western District (c) The Western District comprises the counties of Allegheny, Armstrong, Beaver, Bedford, Blair, Butler, Cambria, Clarion, Clearfield, Crawford, Elk, Erie, Fayette, Forest, Greene, Indiana, Jefferson, Lawrence, McKean, Mercer, Somerset, Venango, Warren, Washington, and Westmoreland. Court for the Western District shall be held at Erie, Johnstown, and Pittsburgh.