U.S. Route 202 (US 202) is a US Highway running from New Castle, Delaware, northeast to Bangor, Maine. In the U.S. state of Pennsylvania, the route runs for , from the Delaware state line in Bethel Township, Delaware County, to the New Hope–Lambertville Toll Bridge over the Delaware River in Solebury Township, where the route crosses into New Jersey. The highway runs through the western and northern suburbs of the Philadelphia metropolitan area, and serves as a toll-free bypass around the city, avoiding the busy traffic and congestion on Interstate 95 (I-95). It is signed north–south and follows a general southwest–northeast direction through the state.

Route description

Delaware County

US 202 enters Pennsylvania from Delaware in Bethel Township, Delaware County, heading north on four-lane divided Wilmington–West Chester Pike. The road soon crosses into Concord Township and continues past commercial development, coming to an intersection with the western terminus of PA 491 and Beaver Valley Road in the community of Johnsons Corners. Past this intersection, the route splits into a one-way pair carrying two lanes in each direction and heads northwest past businesses and some homes, reaching a junction with Smithbridge Road in the community of Elam. Both directions of US 202 rejoin and the route continues north as a four-lane divided highway into Chadds Ford Township, where it becomes a five-lane road with a center left-turn lane and runs through more commercial areas. The road passes through the community of Brandywine Summit and transitions into a four-lane divided highway again, curving northwest and forming the border between Chadds Ford Township to the southwest and Concord Township to the northeast. The route comes to an intersection with US 1/US 322 (Baltimore Pike) in the community of Painters Crossing, where US 322 heads east along US 1 and turns northwest for a concurrency with US 202. US 202/US 322 heads northwest along a four-lane divided highway between businesses to the southwest and an office park to the northeast. The two routes come to an intersection with Oakland Road that has a southbound jughandle. The road continues into a mix of fields and commercial development and fully enters Chadds Ford Township, running a short distance to the west of the border with Thornbury Township. The two routes pass more development before reaching an intersection with Brintons Bridge Road/Dilworthtown Road.

Chester County Upon crossing Brintons Bridge Road/Dilworthtown Road, US 202/US 322 enters Birmingham Township in Chester County and continues northwest along four-lane divided Wilmington Pike past businesses a short distance west of the Thornbury Township border. The road crosses into Thornbury Township and passes between suburban residential neighborhoods. The two routes continue into business areas and reach an intersection with PA 926 in the community of Darlington Corners. Upon crossing PA 926, US 202/US 322 heads into Westtown Township and passes between farmland to the west and wooded residential neighborhoods to the east. The road runs past more homes and commercial establishments, coming to a jughandle-controlled intersection at Stetson Middle School Drive/Skiles Boulevard. Past here, two routes head north-northwest through wooded areas of residences and businesses.

US 202/US 322 comes to a trumpet interchange with the south end of the West Chester Bypass, which bypasses the borough of West Chester to the east. At this point, US 202/US 322 heads northeast onto the four-lane divided West Chester Bypass into West Goshen Township, while US 322 Bus. continues north (west) on South High Street into West Chester, providing access to the West Chester University campus. US 202/US 322 follows the bypass past industrial parks to an at-grade intersection with South Matlack Street, at which point the bypass becomes a four-lane freeway. The highway curves north and passes over the West Chester Railroad. Past this, the freeway comes to a diamond interchange at Westtown Road. US 202/US 322 continues north near residential neighborhoods and reaches a partial cloverleaf interchange with PA 3. Following this, the two routes come to a partial cloverleaf interchange serving Paoli Pike. The freeway continues near residential and commercial development before reaching a northbound exit and southbound entrance where US 322 splits from US 202 to continue west along the two-lane undivided West Chester Bypass to the north of West Chester.

Past the US 322 split, US 202 heads north as an unnamed four-lane freeway near business parks and passes to the west of Brandywine Airport, at which point it crosses the East Branch Chester Creek as it comes to a northbound exit and southbound entrance with the southern terminus of the PA 100 freeway. The route heads north-northeast near more business parks before it runs near wooded neighborhoods and reaches a diamond interchange at Boot Road. Following this, the freeway crosses into East Goshen Township and curves to the north-northwest, entering West Whiteland Township and passing through more wooded areas with nearby homes and commercial development. US 202 bends to the northeast as it enters the Great Valley and comes to a bridge over Amtrak's Keystone Corridor railroad line and an abandoned railroad line before it reaches an interchange with US 30 and the eastern terminus of US 30 Bus. at Lincoln Highway in the community of Glenloch. At this interchange, US 30 heads west on the Exton Bypass freeway and east on at-grade Lincoln Highway while US 30 Bus. heads west along Lincoln Highway. From here, US 202 widens to six lanes and crosses into East Whiteland Township. The highway heads to the northwest of the community of Frazer, running through a mix of fields, woods, and development. The freeway passes over the Chester Valley Trail before it comes to a diamond interchange at PA 401, where it also crosses Valley Creek. After this interchange, the route bends east and runs through wooded areas, heading across the creek again.

US 202 reaches an interchange with PA 29 in a commercial area to the south of the Great Valley Corporate Center and the Penn State Great Valley university campus. Following this, the freeway continues east-northeast near commercial development before crossing into Tredyffrin Township and running through wooded areas with nearby residential neighborhoods, with the Chester Valley Trail parallel to the south. Farther east, the route comes to a northbound exit and southbound entrance at Swedesford Road that provides access to PA 252. US 202 turns northeast and runs near business parks, curving east to reach a partial cloverleaf interchange at Chesterbrook Boulevard south of the community of Chesterbrook. A short distance later, the freeway has a southbound exit to southbound PA 252 and northbound entrance from northbound PA 252. The route heads east, with PA 252 closely parallel to the south, between residential areas to the north and business areas to the south. US 202 comes to an interchange serving PA 252 and North Valley Forge Road, with PA 252 heading north away from US 202. The freeway is paralleled with Swedesford Road as a frontage road on each side and the Chester Valley Trail to the south, with a northbound exit providing access to West Valley Road. Following this, the frontage roads end and the route runs east-northeast past office parks with the trail to the south. The freeway comes to a northbound exit providing access to eastbound I-76 and Devon Park Drive and a southbound entrance from Swedesford Road. A short distance later, US 202 reaches a trumpet interchange with the eastern terminus of the US 422 freeway. This interchange also has access from southbound US 202 to Swedesford Road via the ramp to US 422 westbound as well as from Devon Park Drive to northbound US 202 via the ramp from US 422 eastbound.

Montgomery County

Past the US 422 interchange, the US 202 freeway enters Upper Merion Township in Montgomery County and continues into the community of King of Prussia. The route runs past office parks and businesses south of the Village at Valley Forge, a residential and retail development which contains the King of Prussia Town Center lifestyle center, with the southbound collector-distributor ramp to westbound US 422 and Swedesford Road parallel to the southbound lanes. The freeway comes to a modified cloverleaf interchange with I-76. This interchange provides all connections between I-76 and US 202, with the ramp from northbound US 202 to eastbound I-76 splitting from US 202 south of the US 422 interchange. In the southbound direction, a parallel collector-distributor ramp splits off to serve eastbound I-76, westbound US 422, and Swedesford Road. I-76 heads west to provide access to the Pennsylvania Turnpike at the western terminus of I-276 at the Valley Forge interchange and east to provide access to the city of Philadelphia. Following this interchange, the freeway ends and US 202 becomes West Dekalb Pike, an eight-lane divided highway with at-grade intersections. The route heads into business areas and intersects Gulph Road, at which point it passes southeast of the King of Prussia shopping mall. At the junction with Mall Boulevard/Shaffer Road, the roadway reduces to five lanes with two northbound lanes and three southbound lanes. Following the Allendale Road/Forge Road intersection, the divided road narrows to four lanes, with two lanes in each direction. The route runs between commercial establishments to the northwest and residential areas to the southeast, coming to a bridge over the Pennsylvania Turnpike (I-276). US 202 continues southeast of a neighborhood and heads past more businesses, reaching an intersection with Henderson Road. From here, the route becomes East Dekalb Pike and runs through more commercial areas, crossing the Chester Valley Trail and bending to the north-northeast.