Union Street, State Street, West Main Street, East Main Street, Main Street, West Grand Avenue, East Grand Avenue, Bunting Street, Pottsville-Minersville Highway, West Market Street, South Centre Street, Mauch Chunk Street, Weigand Boulevard, Coal Street, Pike Street, Market Street, Valley Street, North Valley Street, West Broad Street, East Broad Street, West Water Street, East Water Street, West Patterson Street, East Patterson Street, West Catawissa Street, East Catawissa Street, Lehigh Avenue, Susquehanna Street, North 1st Street, Sgt. Stanley Hoffman Boulevard, Bankway Street, Bridge Street, Interchange Road, Seven Bridge Road, Marshalls Creek Bypass, Milford Road, Federal Road, East Harford Street, Broad Street, Pennsylvania Avenue

Southern Terminus:
PA 147 in Millersburg
Northern Terminus:
Pennsylvania-New York state line
Dauphin, Schuylkill, Carbon, Monroe, Pike

US 209 is a diagonal route extending northeast and southwest between Millersburg, Pennsylvania, and Kingston, New York. It begins at PA 147 in Millersburg. It does not connect to any other US route at the southern terminus. However, it begins a few blocks away from a ferry across the Delaware River to US 15. For most of its length in Pennsylvania, US 209 is a two-lane undivided road through rural areas and small towns. In Effort, it joins PA 33 for a couple of exits and then splits off to become a four-lane divided highway with some traffic lights that runs diagonally for a little over a mile to I-80, with which it is multiplexed for a few exits. There is a business route through the local streets of Stroudsburg in this area. US 209 splits off from I-80. Near Bushkill, it enters the Delaware Water Gap National Recreation Area. Within this park, it is maintained by the National Park Service. It eventually reaches the northern end of the park at Milford, where it joins US 6. The two routes are multiplexed east to Matamoras, where there is a bridge across the Delaware River to New York.

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