Yavapai, the N. E. county of Arizona, bounded N. by Utah and E. by New Mexico; area, over 50,000 sq. m.; pop. in 1870, 2,142. The Colorado river crosses the N. W. corner, passing through deep and precipitous canons. The N. E. corner is watered by a tributary of the Rio San Juan, the S. part by several affluents of the Gila, and the S. W. corner by the Rio Santa Maria, a branch of Bill Williams fork. The Colorado Chiquito, for a considerable portion of its course walled in by precipitous canons, flows N. W. through the county near the centre, and empties into the Colorado. The greater portion of the surface has an elevation of 5,000 or 6,000 ft. above the sea, and some parts rise much higher. There are numerous mountain ranges, generally running N. and S. The N. part is mostly unexplored. The central and E. portions contain valuable farming, pastoral, and mining lands. The settlements are in the southwest, in the mining regions of Prescott and Wiokenburg. The soil here is fertile, and pine forests abound. Gold and silver are found.

In the northeast are the Moqui Indians. Capital, Prescott.