U.S. Highway 1A (US 1A, also stylized as US 1-A) is a 9.0-mile-long (14.5 km) alternate route of US 1 through the towns of Wake Forest and Youngsville in North Carolina.

US 1A enters Youngsville from the southwest and runs concurrently with NC 96 for 0.6 miles (0.97 km) along College Street and Park Avenue before diverging to the north.

The southern terminus of US 1A is located at an at-grade intersection with US 1 and Falls of Neuse Road south of Wake Forest.

After intersecting Ligon Mill Road, US 1A adjusts slightly to the north, giving the highway a more northerly orientation.

At Forestville, the highway approaches CSX Transportation's S-Line[4] from the southwest and parallels it for much of its remaining route.

From the intersection, US 1A travels north along South Main Street, west of the downtown district of Wake Forest.

The highway passes to the west of Glen Royall Mill Village Historic District before exiting Wake Forest to the north.

[3][5] At the Wake County–Franklin county line, the road name changes from North Main Street to Youngsville Boulevard.

[3][5] The North Carolina Department of Transportation (NCDOT) measures average daily traffic volumes along many of the roadways it maintains.

[6][7] The general routing of modern US 1A appeared in a 1916 proposal for North Carolina's state highway system plan.