25 Pa. Stat. § 2201
Until the next United States decennial census is taken, and an apportionment made thereon, the Senate shall consist of fifty members, and the State is hereby apportioned into fifty senatorial districts, each of which shall be known by the number herein attached thereto, and shall each be entitled to elect one Senator as follows, to wit:
First District.--The first, twenty-sixth, thirty-sixth, thirty-ninth, and forty-eighth wards of the city of Philadelphia.
Second District.--The second, third, fourth, seventh, eighth, ninth, and thirtieth wards of the city of Philadelphia.
Third District.--The fifth, sixth, tenth, eleventh, twelfth, thirteenth, fourteenth, sixteenth, and eighteenth wards of the city of Philadelphia.
Fourth District.--The twenty-fourth, twenty-seventh, thirty-fourth, fortieth, forty-fourth, and forty-sixth wards of the city of Philadelphia.
Fifth District.--The seventeenth, nineteenth, twentieth, thirty-first, and thirty-seventh wards of the city of Philadelphia.
Sixth District.--The twenty-first, twenty-second, thirty-eighth, and forty-second wards of the city of Philadelphia.
Seventh District.--The fifteenth, twenty-eighth, twenty-ninth, thirty-second, and forty-seventh wards of the city of Philadelphia.
Eighth District.--The twenty-third, twenty-fifth, thirty-third, thirty-fifth, forty-first, forty-third, and forty-fifth wards of the city of Philadelphia.
Ninth District.--The county of Delaware.
Tenth District.--The county of Bucks.
Eleventh District.--The county of Berks.
Twelfth District.--The county of Montgomery.
Thirteenth District.--All that part of the county of Lancaster not included in the seventeenth district.
Fourteenth District.--The counties of Carbon, Monroe, Pike, and Wayne.
Fifteenth District.--The county of Dauphin.
Sixteenth District.--The county of Lehigh.
Seventeenth District.--The county of Lebanon; and the boroughs of Adamstown, Akron, Columbia, Denver, Elizabethtown, Ephrata, Lititz, Manheim, Marietta, and Mount Joy, and Mountville; and the townships of Clay, Conoy, East Cocalico, East Donegal, Elizabeth, Ephrata, Mount Joy, Penn, Rapho, Warwick, West Cocalico, West Donegal, and West Hempfield, in the county of Lancaster.
Eighteenth District.--The county of Northampton.
Nineteenth District.--The county of Chester.
Twentieth District.--The townships of Black Creek, Butler, Conyngham, Dallas, Denison, Dorrance, Foster, Fairmount, Fairview, Hazle, Hollenback, Hunlock, Huntingdon, Lake, Lehman, Jackson, Kingston, Nescopeck, Plymouth, Ross, Salem, Slocum, Sugarloaf, Union, and Wright; and the boroughs of Conyngham, Courtdale, Dallas, Dorranceton, Edwardsville, Forty Fort, Freeland, Jeddo, Kingston, Larksville, Nanticoke, Nescopeck, New Columbus, Nuangola, Plymouth, Shickshinny, West Hazleton, and White Haven; and the city of Hazleton, in the county of Luzerne.
Twenty-first District.--The residue of the county of Luzerne, not included in the twentieth district.
Twenty-second District.--The county of Lackawanna.
Twenty-third District.--The counties of Bradford, Susquehanna, and Wyoming.
Twenty-fourth District.--The counties of Columbia, Lycoming, Montour, and Sullivan.
Twenty-fifth District.--The counties of McKean, Potter, and Tioga.
Twenty-sixth District.--The counties of Cameron, Clarion, Clinton, Elk, and Forest.
Twenty-seventh District.--The counties of Northumberland, Snyder, and Union.
Twenty-eighth District.--The county of York.
Twenty-ninth District.--The county of Schuylkill.
Thirtieth District.--The counties of Blair and Huntingdon.
Thirty-first District.--The counties of Cumberland, Juniata, Mifflin, and Perry.
Thirty-second District.--The county of Fayette.
Thirty-third District.--The counties of Adams and Franklin.
Thirty-fourth District.--The counties of Centre and Clearfield.
Thirty-fifth District.--The county of Cambria.
Thirty-sixth District.--The counties of Bedford, Fulton, and Somerset.
Thirty-seventh District.--The counties of Indiana and Jefferson.
Thirty-eighth District.--The first, second, sixth, ninth, sixteenth, seventeenth, eighteenth, and nineteenth wards of the city of Pittsburgh, in the county of Allegheny.
Thirty-ninth District.--The county of Westmoreland.
Fortieth District.--All the boroughs and townships in that portion of Allegheny County lying north of the Ohio and Allegheny Rivers; and the boroughs of East Pittsburgh, East McKeesport, Pitcairn, Turtle Creek, Wall, and Wilmerding; and the townships of Braddock, Patton, Plum, and Wilkins, in the county of Allegheny.
Forty-first District.--The counties of Armstrong and Butler.
Forty-second District.--The twenty-first, twenty-second, twenty-third, twenty-fourth, twenty-fifth, twenty-sixth, and twenty-seventh wards of the city of Pittsburgh, in the county of Allegheny.
Forty-third District.--The third, fourth, fifth, seventh, eighth, tenth, and fifteenth wards of the city of Pittsburgh, in the county of Allegheny.
Forty-fourth District.--The eleventh, twelfth, thirteenth, and fourteenth wards of the city of Pittsburgh, the city of McKeesport, and all the boroughs and townships in that portion of Allegheny County lying between the Allegheny and Monongahela Rivers, not included in the fortieth district.
Forty-fifth District.--All the boroughs and townships in that portion of Allegheny County lying south of the Ohio and Monongahela Rivers, and the twentieth ward of the city of Pittsburgh, in said county.
Forty-sixth District.--The counties of Greene and Washington.
Forty-seventh District.--The counties of Beaver and Lawrence.
Forty-eighth District.--The counties of Venango and Warren.
Forty-ninth District.--The county of Erie.
Fiftieth District.--The counties of Crawford and Mercer.
25 P.S.§ 2201