PA 3 crosses into Marple Township and soon intersects Springfield Road. The road passes more homes and businesses and comes to a junction with PA 320 in the community of Broomall. The route continues near suburban neighborhoods with some businesses before it reaches a partial cloverleaf interchange with I-476. Past the I-476 interchange, PA 3 intersects Lawrence Road and crosses the Darby Creek into Haverford Township, where another section of Lawrence Road splits to the north. The road continues east past homes and businesses as it passes through the community of Havertown, reaching a junction with Eagle Road. PA 3 has an intersection with Manoa Road as it passes to the north of the Llanerch Country Club, continuing through suburban development. Farther east, the route crosses Naylors Run and heads into the community of Llanerch, where it intersects Darby Road a short distance before coming to a junction with US 1. After crossing US 1, PA 3 enters Upper Darby Township and continues past suburban businesses and homes. The road crosses State Road and heads into more urban areas of residential and commercial development. A set of SEPTA trolley tracks begins running in the median before the route comes to Terminal Square, where it crosses SEPTA's Route 101 and 102 trolley lines at-grade and intersects Victory Avenue/Garrett Road. Past this, PA 3 heads east on four-lane undivided Market Street as it passes between SEPTA's 69th Street Transportation Center to the north and urban businesses to the south, gaining a median before the 69th Street intersection. The route becomes undivided again and runs past more commercial development, forming the border between the borough of Millbourne to the north and Upper Darby Township to the south. PA 3 heads past some homes before turning into a divided highway at the eastern edge of Millbourne as SEPTA's Market–Frankford Line rises to pass over the road. Philadelphia County PA 3 crosses the Cobbs Creek into the city of Philadelphia in Philadelphia County, where it immediately splits from Market Street by turning south onto Cobbs Creek Parkway at the 63rd Street station on the Market–Frankford Line. The route follows four-lane undivided Cobbs Creek Parkway between woods along the creek to the west and urban development to the east before it splits east onto a one-way pair. The eastbound direction of PA 3 follows Chestnut Street while the westbound direction of PA 3 follows Walnut Street