West Virginia Route 31
Route information
Maintained by WVDOH
Length	36.7 mi[1] (59.1 km)
Major junctions
South end	WV 16 in Harrisville
Major intersections	US 50 near Cairo WV 2 near Waverly WV 14 concurrent near Williamstown
North end	SR 60 in Marietta, Ohio
Location
Country	United States
State	West Virginia
Counties	Wood, Ritchie
Highway system
West Virginia State Highway System Interstate US State
← US 30 → WV 32

West Virginia Route 31 is a north–south state highway in the northwestern portion of the U.S. state of West Virginia. The northern terminus of the route is at the Ohio state line on the Williamstown Bridge over the Ohio River.^[2][3] The southern terminus is at West Virginia Route 16 in Harrisville, West Virginia.^[4]

The northernmost extent of the route from West Virginia Route 14 near Interstate 77 Exit 185 southeast of Williamstown to the Ohio state line is not signed.^[5]

Major intersections

County	Location	mi	km	Destinations	Notes
Ritchie	Harrisville			WV 16 (Spring Street) – Ellenboro, Grantsville
	​			US 50 east – Clarksburg	south end of US 50 overlap
Wood	Deerwalk			US 50 west / CR 50/16 (Riser Ridge Road) – Parkersburg	north end of US 50 overlap
	​			WV 2 south – Parkersburg	south end of WV 2 overlap
	​			WV 2 north – Wheeling	north end of WV 2 overlap
	Williamstown			WV 14 north to I-77 – Parkersburg, Marietta, OH	north end of signed WV 31; south end of WV 14 overlap
				WV 14 south – Vienna	north end of WV 14 overlap
				To Williamstown Bridge (SR 60 north) / SR 7 – Marietta
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus