Pennsylvania Senate, District 21
Pennsylvania's 21st Senatorial district includes parts of Butler, Clarion, Erie, Forest, Venango And Warren Counties.
- Allegheny Township
- Brady Township
- Butler Township
- Butler
- Center Township
- Cherry Township
- Clay Township
- Franklin Township
- Harrisville
- Marion Township
- Mercer Township
- Muddy Creek Township
- Portersville
- Prospect
- Slippery Rock Township
- Slippery Rock
- West Liberty
- West Sunbury
All of Clarion County
- Amity Township
- Concord Township
- Corry
- Elgin
- Greenfield Township
- Leboeuf Township
- Mill
- North East Township
- North East Township
- Union City Township
- Union Township
- Venango Township
- Village Township
- Waterford Township
- Waterford Township
- Wattsburg Township
- Wayne Township
All of Forest county
All of Venango County
- Bear Lake
- Brokenstraw Township
- Cherry Grove Township
- Columbus Township
- Conewango Township
- Deerfield Township
- Eldred Township
- Elk Township
- Farmington Township
- Freehold Township
- Glade Township
- Limestone Township
- Pine Grove Township
- Pittsfield Township
- Pleasant Township
- Sheffield Township
- Southwest Township
- Spring Creek Township
- Sugar Grove Township
- Sugar Grove
- Tidioute
- Triumph Township
- Watson Township
- Youngsville
Total population: 240,891
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