Pennsylvania Route 75 (PA 75) is a north–south state highway located in central Pennsylvania. The southern terminus is at the Mason–Dixon line in Montgomery Township, where the road continues into Maryland as Maryland Route 494 (MD 494). The northern terminus is at an interchange with U.S. Route 22 (US 22) and US 322 northeast of Port Royal. PA 75 is a two-lane undivided road that passes through the Ridge-and-Valley Appalachians in Franklin and Juniata counties. The route heads north from the Maryland border in Franklin County to Mercersburg, where it runs concurrent with PA 16 and PA 416. From Mercersburg, PA 75 heads north and crosses US 30 in Fort Loudon before it runs northeast through a long valley, where it has an interchange with the Pennsylvania Turnpike (Interstate 76 or I-76) in Willow Hill. The route turns north and heads into Juniata County, where it continues through another valley. PA 75 passes through Port Royal and crosses the Juniata River before it comes to its terminus at US 22/US 322.
PA 75 was designated in 1928 to run from US 30 in Fort Loudon north to US 22 (William Penn Highway) northeast of Port Royal. In 1937, PA 75 was extended south from Fort Loudon to the Maryland border. The route was realigned to bypass Blairs Mills on a shorter alignment to the east in the 1930s. In the 1970s, PA 75 was extended north to the new US 22/US 322 freeway on a road that was widened into a divided highway by 1990.
Route description
Franklin County
PA 75 begins at the Maryland border in Montgomery Township, Franklin County, where the road continues south into that state as MD 494. From the state line, the route heads north on two-lane undivided Fort Loudon Road through open agricultural areas with occasional homes. The road passes through Kasiesville before coming to Claylick and intersecting PA 995. PA 75 runs through more farmland with some woods and residences, passing through Shimpstown. The road heads through more open agricultural areas prior to entering the borough of Mercersburg, where it passes homes. PA 75 comes to an intersection with PA 16/PA 416, where it turns northwest to form a concurrency with the two routes on Buchanan Trail West. The three routes turn north onto Main Street and passes homes and businesses in the center of Mercersburg. In the northern part of town, PA 16 heads to the northwest with PA 75 and PA 416 continuing northeast on Fort Loudon Road. The road passes a few residential and commercial areas before crossing into Peters Township and heading into agricultural surroundings. PA 416 splits from PA 75 by continuing northeast on Mercersburg Road. At this point, the route runs through more open farmland with some residences, passing through Dickey. The road turns northwest to run a short distance east of the West Branch Conococheague Creek before coming to an intersection with US 30 near Fort Loudon.
Here, PA 75 turns to the north and becomes Path Valley Road, passing through rural areas of homes. The route heads into forested areas with some homes between Tuscarora Mountain to the west and Kittatinny Mountain to the east, crossing into Metal Township. The road turns east for a short distance before heading north again, passing through Richmond Furnace. PA 75 runs through more forests before heading into a narrow agricultural valley with a few residences and curving to the northeast, heading through Metal. Farther to the northeast, the agricultural valley widens and the route runs through Fannettsburg and Springtown before coming to a ramp providing access to I-76 (Pennsylvania Turnpike). At this point, the road runs through more rural valley areas a short distance to the east of the Pennsylvania Turnpike, passing through Willow Hill prior to passing under the Pennsylvania Turnpike. PA 75 runs through more open farmland and enters Fannett Township, coming to an intersection with PA 641 in the community of Spring Run. The route heads through more rural areas and passes through Dry Run. The road heads into a mix of farmland and woodland with some homes and turns north at Doylesburg, coming to a junction with the western terminus of PA 274. Past this intersection, PA 75 continues to the north and heads through Concord before heading into forested areas and crossing through a gap in Tuscarora Mountain.