The following highways are numbered 634:
| Preceded by 633 | Lists of highways 634 | Succeeded by 635 |
State Route 352 is a primary state highway in the U.S. state of Virginia. Known as St. Charles Road, the state highway runs 2.40 miles (3.86 km) from U.S. Route 421 near Pennington Gap to SR 634 and SR 636 in St. Charles in northern Lee County.
State Route 190 (SR 190) is a 8.93-mile-long (14.37 km) north–south state highway in the western portion of the U.S. state of Ohio. The southern terminus of SR 190 is at an intersection with SR 66 in Delphos. Its northern terminus is at an intersection with US 224 approximately 4 miles (6.4 km) east of Ottoville.
State Route 634 (SR 634) is a 17.95-mile-long (28.89 km) state highway in the northwestern portion of the U.S. state of Ohio. The highway runs from its southern terminus at its junction with SR 189 and SR 190 in Fort Jennings to its northern terminus at the intersection of SR 15 nearly 1.5 miles (2.4 km) north of Continental. SR 634 runs entirely within Putnam County and is entirely a two-lane highway.
