Pennsylvania Route 21
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| Route information | ||||
| Maintained by PennDOT | ||||
| Length: | 50.751 mi (81.676 km) | |||
| Existed: | 1927 – present | |||
| Major junctions | ||||
| West end: |
 WV 891 in Richhill Township
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 US 19 in Waynesburg I-79 in Morrisville  US 40 / US 119 in Uniontown
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| East end: |
 US 40 Bus. in Uniontown |
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| Location | ||||
| Counties: | Greene, Fayette | |||
| Highway system | ||||
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Pennsylvania Route 21 (PA 21) is a 50.75-mile (81.67 km) long east–west state highway in the US state of Pennsylvania. The western terminus of the route is at the West Virginia state line in Richhill Township, where PA 21 continues into West Virginia as West Virginia Route 891. The eastern terminus is at U.S. Route 40 Business in Uniontown. The route is known as the Roy E. Furman Highway for most of its length. PA 21 serves Waynesburg and Masontown along the way.
PA 21 was originally designated in 1927 between the West Virginia border and Uniontown, originally following an alignment further to the north between Carmichaels and Uniontown via New Salem. By 1950, the route was moved to its current alignment east of Carmichaels, with bypasses of Carmichaels and Masontown constructed by 1960.
Pennsylvania Route 21 enters Greene County in Richhill Township near the village of Polen. The highway winds its way through the hilly and sparsely populated area passing Ryerson Station State Park to the north. It continues to the northeast into Gray Township where it veers to the southeast toward the village of Rogersville in Center Township. Just before reaching Rogersville, Route 21 merges with Pennsylvania Route 18 near West Greene High School. Route 18 leaves Route 21 near West Waynesburg while Route 21 continues into the borough of Waynesburg.
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