There are 15 counties in Arizona. Each county is governed by a board of supervisors.
There are 80 county subdivisions in Arizona. They are all census county divisions (CCDs), which are delineated for statistical purposes, have no legal function, and are not governmental units.
Arizona Counties - Populated Places in 15 Counties
Also see County: Census Data | Physical, Cultural & Historical Features | ZIP Codes | Land, Farms, & Ranches