Largest Counties in Arizona

Rank County Population County Seat Established Area (km2) Density
1 Maricopa County 3,990,170 Phoenix 1871 23,890 167.02
2 Pima County 1,003,224 Tucson 1864 23,799 42.15
3 Pinal County 324,951 Florence 1875 13,919 23.35
4 Yavapai County 212,624 Prescott 1864 21,051 10.10
5 Mohave County 194,933 Kingman 1864 34,887 5.59
6 Yuma County 190,546 Yuma 1864 14,294 13.33
7 Coconino County 134,410 Flagstaff 1891 48,332 2.78
8 Cochise County 127,855 Bisbee 1881 16,107 7.94
9 Navajo County 111,262 Holbrook 1895 25,794 4.31
10 Apache County 69,969 St. Johns 1879 29,054 2.41
11 Gila County 51,983 Globe 1881 12,422 4.18
12 Santa Cruz County 42,834 Nogales 1899 3,206 13.36
13 Graham County 34,758 Safford 1881 12,020 2.89
14 La Paz County 20,161 Parker 1983 11,689 1.72
15 Greenlee County 7,743 Clifton 1909 4,786 1.62

Largest Counties in Arizona

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