Prescott Valley is a town located in Yavapai County, Arizona, United States, about 8 miles (13 km) east of Prescott, which it has surpassed in growth. Prescott Valley was the seventh fastest-growing place among all cities and towns in Arizona between 1990 and 2000, with a current population in 2019 of about 46,515 residents.
Prescott Valley's Fitzmaurice Ruins contain artifacts from the early Mountain Patayan people who inhabited the area some 1,400 years ago. The Walker Party discovered gold along Lynx Creek in 1863. The Lynx Creek placers went on to produce a recorded 29,000 troy ounces (900 kg) of gold. Estimates of actual production range up to 80,000 troy ounces (2,500 kg), which would be worth about $138 million at 2020 prices.
Prescott Valley, formerly known as Lonesome Valley, was settled by ranchers in the 1880s, raising beef to supply the miners and new settlers. The Fain family, pioneer ranchers, still ranch in the valley.
Thomas Gibson Barlow-Massicks arrived in the area in the early 1890s and built the historic "castle" that still stands in Fain Park. Massicks had a hydraulic gold mining operation in Lynx Creek Canyon and built the company mining camp of Massicks, Arizona just east of his Victorian home, the castle. The fireplace with chimney just inside the castle's fence is all that remains of the Massicks store. Massicks accidentally shot himself and died in April 1899 at the age of 37. In the 1930s, there was a gold dredging operation, the Doodle Bug Diggings, farther east in Lynx Creek Canyon.
In the mid-1960s, Prescott Valley Incorporated, a real-estate company from Phoenix, purchased land in an area 10 miles east of Prescott known as Lonesome Valley.