Pennsylvania Route 491 (PA 491) is a state highway in Delaware County, Pennsylvania. Also known as Naamans Creek Road, the route runs from U.S. Route 202 (US 202) in Concord Township east to the Delaware border in Lower Chichester Township, where the route continues as Delaware Route 491 (DE 491), a  connector between the Pennsylvania border and Delaware Route 92 (DE 92) near Claymont, Delaware. PA 491 runs closely parallel to the Delaware border throughout its route. It intersects Pennsylvania Route 261 (PA 261) in the Booths Corner section of Bethel Township. The western portion of PA 491 was first designated as part of Legislative Route 135 in 1911. In the 1920s, the Delaware portion of road was built as a state highway while PA 491 was created in 1928.