Apache County	001	St. Johns	1879	Yavapai County	The Apache (Ndee) people. Apache is an exonym from Zuni .apa.u "Navajos" or Yavapai .pa.. "enemy".	69,980	11,218 sq mi
(29,054 km2)	State map highlighting Apache County
Cochise County	003	Bisbee	1881	Pima County	Cochise, a Chiricahua Apache chief and leader of an 1861 uprising. Cochise is an anglicisation of K'uu-ch'ish "oak".	127,866	6,219 sq mi
(16,107 km2)	State map highlighting Cochise County
Coconino County	005	Flagstaff	1891	Yavapai County	Coconino is a former designation for the Havasupai, Hualapai, and/or Yavapai, derived from the Hopi exonym Kohonino.	134,421	18,661 sq mi
(48,332 km2)	State map highlighting Coconino County
Gila County	007	Globe	1881	Maricopa and Pinal Counties	The Gila River, a tributary of the Colorado. Possibly from Apache dzil "mountain," via Spanish Xila.	51,994	4,796 sq mi
(12,422 km2)	State map highlighting Gila County
Graham County	009	Safford	1881	Apache and Pima Counties	Mount Graham, in the Pinaleñ Mt. Graham itself is named for topographical engineer James Duncan Graham.[10]	34,769	4,641 sq mi
(12,020 km2)	State map highlighting Graham County
Greenlee County	011	Clifton	1909	Graham County	Mason Greenlee, early prospector. Named by an amendment initially intended to delay the bill creating "Lincoln County".[11]	7,754	1,848 sq mi
(4,786 km2)	State map highlighting Greenlee County
La Paz County	012	Parker	1983	Yuma County	La Paz, Arizona, a historic boomtown on the Colorado River. A common placename, La Paz means "The Peace" in Spanish.	20,172	4,513 sq mi
(11,689 km2)	State map highlighting La Paz County
Maricopa County	013	Phoenix	1871	Pima and Yavapai Counties	The Maricopa (Piipaash) people. First attested in Spanish as Cocomaricopa, no origin or meaning is definitively known.	3,990,181	9,224 sq mi
(23,890 km2)	State map highlighting Maricopa County
Mohave County	015	Kingman	1864	.	The Mohave (Aha Makhav) people. The Mohave endonym means "along the water," referring to the Colorado.[12]	194,944	13,470 sq mi
(34,887 km2)	State map highlighting Mohave County
Navajo County	017	Holbrook	1895	Apache County	The Navajo (Dinépeople. Navajo is an exonym from Tewa Navahu "big field," referring to the San Juan River Valley	111,273	9,959 sq mi
(25,794 km2)	State map highlighting Navajo County
Pima County	019	Tucson	1864	.	The Pima (Akimel O'odham) people. Pima is a Spanish exonym from the O'odham phrase pi mac "(I) don't know," presumably heard during initial encounters.	1,003,235	9,189 sq mi
(23,799 km2)	State map highlighting Pima County
Pinal County	021	Florence	1875	Maricopa and Pima counties	Pinal Peak, possibly from Spanish pinal "place of pines". Pinal Peak is now within the borders of Gila County.	324,962	5,374 sq mi
(13,919 km2)	State map highlighting Pinal County
Santa Cruz County	023	Nogales	1899	Cochise and Pima counties	Santa Cruz River, a tributary of the Gila. A common placename, Santa Cruz means "Holy Cross" in Spanish.	42,845	1,238 sq mi
(3,206 km2)	State map highlighting Santa Cruz County
Yavapai County	025	Prescott	1864	.	The Yavapai people. The Yavapére one of four major Yavapai bands.	212,635	8,128 sq mi
(21,051 km2)	State map highlighting Yavapai County
Yuma County	027	Yuma	1864	.	Yuma is a former name of the Quechan people, derived from the O'odham exonym Yum..	190,557	5,519 sq mi
(14,294 km2)	State map highlighting Yuma County