How Many Lunar Roving Vehicles are still parked on the Moon?

Three. Rover Apollo 15 was left on the lunar surface at Hadley-Apennine (26.10 N, 3.65 E). Rover Apollo 16 was left on the lunar surface at Descartes (8.99 S, 15.51 E) and Rover Apollo 17 was left on the lunar surface at Taurus-Littrow (20.16 N, 30.76 E) They will stand intact for thousands of years.