State Route 236 is a primary state highway in the U.S. state of Virginia. The state highway runs 15.63 miles (25.15 km) from U.S. Route 29 and US 50 in Fairfax east to SR 400 in Alexandria. SR 236 is a major suburban arterial highway that connects the independent cities of Fairfax and Alexandria via Annandale in Fairfax County. The state highway is known as Main Street in City of Fairfax, Little River Turnpike in Fairfax County, where the highway meets Interstate 495 (I-495), and Duke Street in Alexandria, where the road has junctions with I-395 and US 1.

U.S. Route 29 (US 29) is a major north–south route in the commonwealth of Virginia. It covers 248.0 miles (399.1 km) from the North Carolina border at the city of Danville to the Key Bridge in Washington DC. US 29 roughly bisects Virginia into eastern and western halves and, along with Interstate 81 (I-81) and US 11 in western Virginia and I-85/I-95 as well as US 1 farther east, provides one of the major north–south routes through the commonwealth.