The western terminus was moved to its current location in 1947, with the section west of US 13 becoming part of SR 703.

SR 175 begins at an intersection with US 13 (Lankford Highway) at Nash Corner 4 miles (6.4 km) south of the Maryland state line.

The state highway heads east as two-lane undivided Chincoteague Road through a mix of farmland and woodland.

SR 175 heads east, intersecting SR 798 (Atlantic Avenue) again, then curves north through Wallops Island National Wildlife Refuge and around NASA's Wallops Flight Facility, a rocket launch site operated as a subsidiary of Goddard Space Flight Center.

While heading north parallel to one of the flight facility's runways, the state highway passes the NASA Visitor Center.

[2][3][4] SR 175 heads east onto the John B. Whealton Memorial Causeway between the mainland and Chincoteague Island.

[2][3][4] SR 175 serves as the access road from US 13 to both Chincoteague and the Virginia section of Assateague Island.

[6] The road between US 13 in Oak Hall and Chincoteague Island became a part of the state highway system as SR 520 in August 1928.

The project constructed a bascule bridge over Black Narrows and Chincoteague Channel that would enter the island and terminate at Main Street and Maddox Boulevard, replacing the previous crossing by way of Marsh Island that consisted of a swing bridge over the Chincoteague Channel.

The route ran from SR 175 near the eastern end of the original causeway onto the island north along Main Street to the northern border of Chincoteague.