Arizona County Creation Dates and Parent Counties

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United States Gotoarrow.png Arizona Gotoarrow.png County Creation Dates

Arizona Territory was created on 24 February 1863 from the west half of New Mexico Territory. All previous New Mexico counties were discontinued, but it was not until 10 November 1864, when the first four Arizona counties were created. Pah-Ute county is the only county discontinued, in 1871. All the other created counties still continue. The last county created was La Paz on 27 April 1983.

In the present day there are a total of 15 counties; 8 of them named for Native American Tribes, 2 of them for People, 2 of them for Mountains, 2 of them for Rivers, and 1 of them for a Town.

The information listed below is useful in identifying which county your ancestor lived in at what time. Once you have that information, you can contact that county's offices for records of your ancestor. If you don't find records in the identified county, look in nearby counties. Some changes have been made to the boundaries of the counties.

Name of County Date Formed Parent County Progeny County
Apache 14 Feb 1879 Yavapai Graham 1881, Navajo 1895
Cochise 1 Feb 1881 Pima

none

Coconino 19 Feb 1891 Yavapai none
Gila 8 Feb 1881 Maricopa, Pinal

none

Graham 10 Mar 1881 Apache, Pima Greenlee 1909
Greenlee 10 Mar 1909 Graham none
La Paz 27 Apr 1983 Yuma none
Maricopa 14 Feb 1871 Yavapai Pinal 1875, Gila 1881
Mohave 10 Nov 1864 Arizona Territory Pah-Ute 1865, portion to Nevada 1866
Navajo 21 Mar 1895 Apache none
Pah-Ute 22 Dec 1865 Mohave portion to Nevada 1866, disbanded 1871
Pima 10 Nov 1864 Arizona Territory Pinal 1875, Cochise 1881, Graham 1881, Santa Cruz 1899
Pinal 1 Feb 1875 Pima, Maricopa

Gila 1881

Santa Cruz 15 Mar 1899 Pima none
Yavapai 10 Nov 1864 Arizona Territory Maricopa 1871, Apache 1879, Coconino 1891
Yuma 10 Nov 1864 Arizona Territory La Paz 1983

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