| County | Population | Up | Area | Pop/M | % State | |
|---|---|---|---|---|---|---|
| Arizona | 5,130,000 | 40% | 114,000 | 45 | 100% | |
| 1 | Maricopa | 3,072,000 | 45% | 9,000 | 341 | 60% |
| – Phoenix | 1,321,000 | 34% | 477 | 2769 | 26% | |
| – Mesa | 395,000 | 38% | 125 | 3168 | 08% | |
| 2 | Pima | 844,000 | 26% | 5,000 | 169 | 16% |
| – Tucson | 487,000 | 20% | 162 | 3006 | 9% | |
| 3 | Pinal | 180,000 | 54% | 5,000 | 36 | 4% |
| 4 | Yavapai | 168,000 | 56% | 8,000 | 21 | 3% |
| – Prescott | 33,000 | 28% | 32 | 1048 | 1% | |
| 5 | Yuma | 160,000 | 20% | 6,000 | 13 | 3% |
| – Yuma | 78,000 | 50% | 22 | 7273 | 2% | |
| 6 | Mohave | 155,000 | 66% | 13,000 | 12 | 3% |
| 7 | Cochise | 118,000 | 21% | 6,000 | 20 | 2% |
| 8 | Coconino | 116,000 | 21% | 19,000 | 6 | 2% |
| – Flagstaff | 53,000 | 15% | 63 | 841 | 1% | |
| 9 | Navajo | 97,000 | 26% | 9,000 | 11 | 2% |
| 10 | Apache | 69,000 | 13% | 11,000 | 6 | 1% |
| 11 | Gila | 51,000 | 28% | 5,000 | 10 | 1% |
| 12 | Santa Cruz | 38,000 | 29% | 1,000 | 38 | •7% |
| 13 | Graham | 33,000 | 26% | 5,000 | 7 | •6% |
| 14 | La Paz | 19,000 | 42% | 9,000 | 2 | •4% |
| 15 | Greenlee | 9,000 | 7% | 2,000 | 4 | •2% |