| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Oak Creek | city | Arizona | United States | 34.77917 | -111.7625 | 4133 | 2867 |
| Oak Grove | city | Arizona | United States | 36.15278 | -113.58306 | 5921 | 33 |
| Oak Knoll Village | city | Arizona | United States | 34.51528 | -112.44389 | 6128 | 17237 |
| Oak Springs | city | Arizona | United States | 35.47556 | -109.12694 | 6797 | 845 |
| Oak Wells | city | Arizona | United States | 32.78889 | -110.93694 | 4386 | 383 |
| Oakhurst | city | Arizona | United States | 33.6425 | -111.95111 | 1489 | 73106 |
| Oatman | city | Arizona | United States | 35.02639 | -114.38278 | 2687 | 432 |
| Ocotillo | city | Arizona | United States | 34.36361 | -112.20111 | 4199 | 168 |
| Ocotillo | city | Arizona | United States | 33.24361 | -111.85778 | 1197 | 12938 |
| Octave | city | Arizona | United States | 34.14167 | -112.68917 | 3572 | 154 |
| Oit Ihuk | city | Arizona | United States | 32.31556 | -112.245 | 2145 | 112 |
| Olberg | city | Arizona | United States | 33.09222 | -111.68556 | 1397 | 793 |
| Old Columbine | city | Arizona | United States | 32.70722 | -109.90889 | 9570 | 212 |
| Old Glory | city | Arizona | United States | 31.43417 | -111.25306 | 3936 | 827 |
| Old Leupp | city | Arizona | United States | 35.28389 | -110.96444 | 4698 | 112 |
| Old Shongopavi historical | city | Arizona | United States | 35.80444 | -110.51972 | 5797 | 336 |
| Old Tucson | city | Arizona | United States | 32.21806 | -111.12944 | 2660 | 4712 |
| Olga | city | Arizona | United States | 32.29972 | -109.35861 | 3628 | 75 |
| Olive City historical | city | Arizona | United States | 33.61111 | -114.525 | 285 | 3150 |
| Olive West | city | Arizona | United States | 33.56944 | -112.215 | 1148 | 169363 |
| One Mile | city | Arizona | United States | 36.805 | -112.05361 | 6433 | 33 |
| Oracle | city | Arizona | United States | 32.61083 | -110.77028 | 4596 | 383 |
| Oracle Foothills Estates | city | Arizona | United States | 32.29972 | -110.95278 | 2401 | 98269 |
| Oracle Junction | city | Arizona | United States | 32.555 | -110.93278 | 3389 | 711 |
| Oracle Place Shopping Center | city | Arizona | United States | 32.33639 | -110.97639 | 2532 | 58222 |
| Oraibi | city | Arizona | United States | 35.87639 | -110.63972 | 5971 | 336 |
| Orange Grove Estates | city | Arizona | United States | 32.32111 | -111.04 | 2253 | 88559 |
| Orangetree | city | Arizona | United States | 33.33694 | -111.89444 | 1181 | 234430 |
| Orangetree Estates | city | Arizona | United States | 33.58639 | -111.96417 | 1397 | 141217 |
| Orangewood Village Mobilehome Park | city | Arizona | United States | 33.65667 | -112.11833 | 1381 | 184722 |
| Oregon Trail Mobile Home Park | city | Arizona | United States | 33.55778 | -112.11444 | 1197 | 285725 |
| Oro Blanco | city | Arizona | United States | 31.49583 | -111.27917 | 3992 | 714 |
| Oro Valley | city | Arizona | United States | 32.39083 | -110.96583 | 2601 | 24727 |
| Otero | city | Arizona | United States | 31.53056 | -111.01417 | 3366 | 747 |
| Out West Trailer Park | city | Arizona | United States | 33.45083 | -112.12806 | 1112 | 140482 |
| Overgaard | city | Arizona | United States | 34.39083 | -110.5525 | 6597 | 336 |
| Overland Trail | city | Arizona | United States | 33.65556 | -112.16 | 1358 | 178970 |
| Owl | city | Arizona | United States | 32.72194 | -113.79139 | 452 | 355 |
| Oxbow Estates | city | Arizona | United States | 34.18306 | -111.33972 | 4724 | 1090 |
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