| Mariano Comense to Olympia Heights (Florida) | 4,946.10 mi (7,959.97 km) |
| Mariano Comense to Omaha (Nebraska) | 4,870.10 mi (7,837.66 km) |
| Mariano Comense to On Top of the World Designated Place (Florida) | 4,876.66 mi (7,848.23 km) |
| Mariano Comense to Onalaska (Wisconsin) | 4,566.06 mi (7,348.37 km) |
| Mariano Comense to Oneida (New York) | 3,985.36 mi (6,413.81 km) |
| Mariano Comense to Oneonta (New York) | 3,984.92 mi (6,413.11 km) |
| Mariano Comense to Ontario (California) | 6,004.45 mi (9,663.22 km) |
| Mariano Comense to Ontario (Oregon) | 5,416.85 mi (8,717.58 km) |
| Mariano Comense to Opa-locka (Florida) | 4,934.05 mi (7,940.59 km) |
| Mariano Comense to Opelika (Alabama) | 4,847.19 mi (7,800.79 km) |
| Mariano Comense to Opelousas (Louisiana) | 5,234.49 mi (8,424.09 km) |
| Mariano Comense to Orange (California) | 6,024.84 mi (9,696.05 km) |
| Mariano Comense to Orange (Texas) | 5,324.64 mi (8,569.18 km) |
| Mariano Comense to Orange City (Florida) | 4,839.85 mi (7,788.98 km) |
| Mariano Comense to Orangeburg (South Carolina) | 4,613.33 mi (7,424.44 km) |
