Valentine is an unincorporated community and census-designated place in Mohave County, Arizona, United States. As of the 2020 census it had a population of 39. Valentine is located on Arizona State Route 66 32 miles northeast of Kingman. The majority of Valentine is located in a geographically isolated exclave of the Hualapai Reservation and the rest of the community is located in unincorporated Mohave County.