Yavapai County yana daya daga cikin jihohi hudu na asali na Arizona da aka kirkiro ta 1st Arizona Territorial Legislature. An bayyana yankin gundumar a matsayin gabas da longitude 113 ° 20 'da arewacin Kogin Gila. Ba da daɗewa ba bayan haka, an sassare yankunan Apache, Coconino, Maricopa, da Navajo daga asalin Yavapai County. An kafa iyakokin yanzu na Yavapai County a 1891. Tambaya: Yaushe aka kafa iyakokin yanzu?
Shekara ta 1891