 Delaware Route 261 ( DE 261 ) and Pennsylvania Route 261 ( PA 261 ) , also known as Foulk Road , is a 6 @.@ 88 @-@ mile ( 11 @.@ 07 km ) state highway running through Delaware and Pennsylvania . DE 261 runs 4 @.@ 62 miles ( 7 @.@ 44 km ) through New Castle County , Delaware from an interchange with U.S. Route 202 ( US 202 ) and DE 141 north of Interstate 95 ( I @-@ 95 ) near Fairfax , Delaware , a community north of Wilmington , northeast to the Pennsylvania state line . The road runs through suburban areas of Brandywine Hundred as a four @-@ lane road south of DE 92 and a two @-@ lane road north of DE 92 . At the Pennsylvania state line , Foulk Road becomes PA 261 and continues 2 @.@ 26 miles ( 3 @.@ 64 km ) through Bethel Township in Delaware County , intersecting PA 491 in <unk> Corner before ending at an interchange with US 322 . 
