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Arizona County Formation years
1852 1854 1855 1860 1861 1862 1863 1864 1865 1866 1871 1873 1875 1877 1879
1881 1889 1891 1895 1899 1909 1983                
unorg. = unorganized
g. = gained
w. = with
fr. = from
atmt. = attachment
exch = exchanged
nca.= non county area
ch. = changed
Ap - Apache
Cch - Cochise
Ccn - Cococino
Gi - Gila
Gra - Graham
Gre - Greenlee
LP - La Paz
Ma - Maricopa
Mo - Mohave
Na - Navajo
Pim - Pima
Pin - Pinal
SC - Santa Cruz
Ya - Yavapai
Yu - Yuma