Known as Fairgrounds Road, the state highway runs 1.38 miles (2.22 km) from SR 179 in Onancock east to U.S. Route 13 Business (US 13 Business) and SR 316 at Tasley.

The state highway heads east as a two-lane undivided road and leaves the town of Onancock by crossing the North Branch of Onancock Creek.

SR 126 reaches its eastern terminus as the west leg of a roundabout in Tasley.

SR 316 heads north as Greenbush Road toward Greenbush; US 13 Business heads east (north) as Tasley Road toward Accomac, the county seat of Accomack County, and south as Coastal Boulevard toward Onley.

[1][2] The entire route is in Accomack County.