| Tucson Estates to Orbetello | 6,118.42 mi (9,846.64 km) |
| Tucson Estates to Oria | 6,444.38 mi (10,371.23 km) |
| Tucson Estates to Oristano | 6,140.03 mi (9,881.42 km) |
| Tucson Estates to Orta Nova | 6,334.57 mi (10,194.50 km) |
| Tucson Estates to Orte | 6,159.92 mi (9,913.43 km) |
| Tucson Estates to Ortona | 6,237.03 mi (10,037.53 km) |
| Tucson Estates to Orvieto | 6,137.39 mi (9,877.18 km) |
| Tucson Estates to Orzinuovi | 5,930.79 mi (9,544.68 km) |
| Tucson Estates to Osimo | 6,148.43 mi (9,894.94 km) |
| Tucson Estates to Ospitaletto | 5,928.34 mi (9,540.75 km) |
| Tucson Estates to Ostuni | 6,430.55 mi (10,348.98 km) |
| Tucson Estates to Ottaviano | 6,314.94 mi (10,162.92 km) |
| Tucson Estates to Ovada | 5,920.61 mi (9,528.30 km) |
| Tucson Estates to Ozieri | 6,124.08 mi (9,855.75 km) |
| Tucson Estates to Paceco | 6,385.34 mi (10,276.21 km) |
