Pennsylvania Route 642
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| Route information | ||||
| Maintained by PennDOT | ||||
| Length: | 21.5 mi (34.5 km) | |||
| Major junctions | ||||
| West end: |
 US 15 in Kelly Township
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 PA 147 near Milton PA 54 in Valley Township
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| East end: |
  PA 44 / PA 254 in Madison Township
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| Location | ||||
| Counties: | Union, Northumberland, Montour, Columbia | |||
| Highway system | ||||
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Pennsylvania Route 642 (PA 642) is a 21.4-mile-long (34.4 km) state highway located in Union, Northumberland, Montour, and Columbia Counties in Pennsylvania. The western terminus is at the intersection of Third Street and Broad Street in West Milton near an interchange with US 15. The eastern terminus is at PA 254 and PA 44 in Jerseytown.
PA 642 begins at a signalized intersection where Third Street (designated SR 1101 by the Pennsylvania Department of Transportation (PennDOT)) and Broad Street (SR 1004) in the community of West Milton in Kelly Township, Union County. The intersection is located just east of an interchange with the US 15 freeway. Third Street is a former section of US 15 and is used to access the northbound lanes of the freeway. PA 642 heads east on two-lane undivided Broad Street. The road passes through residential areas with some businesses before crossing a Union County Industrial Railroad line. The route crosses the West Branch Susquehanna River into Milton, Northumberland County, where the road becomes Mahoning Street and heads onto Montgomery Island, which contains Milton State Park. PA 642 crosses to the east bank of the river and heads southeast through commercial areas, intersecting a one-way pair that carries PA 405. The road crosses Norfolk Southern's Buffalo Line and heads through residential areas. The route enters Turbot Township and runs past more homes, coming to an interchange with the PA 147 freeway. Past this interchange, PA 642 crosses into East Chillisquaque Township and becomes an unnamed road, heading through agricultural areas with some woods and homes. The road turns east and heads through Pottsgrove before crossing the Chillisquaque Creek.
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