| Rocca Priora to Olympia Heights (Florida) | 5,206.60 mi (8,379.21 km) |
| Rocca Priora to Omaha (Nebraska) | 5,182.79 mi (8,340.89 km) |
| Rocca Priora to On Top of the World Designated Place (Florida) | 5,149.56 mi (8,287.42 km) |
| Rocca Priora to Onalaska (Wisconsin) | 4,878.02 mi (7,850.42 km) |
| Rocca Priora to Oneida (New York) | 4,281.36 mi (6,890.18 km) |
| Rocca Priora to Oneonta (New York) | 4,278.85 mi (6,886.15 km) |
| Rocca Priora to Ontario (California) | 6,326.39 mi (10,181.34 km) |
| Rocca Priora to Ontario (Oregon) | 5,741.04 mi (9,239.31 km) |
| Rocca Priora to Opa-locka (Florida) | 5,194.84 mi (8,360.29 km) |
| Rocca Priora to Opelika (Alabama) | 5,133.37 mi (8,261.35 km) |
| Rocca Priora to Opelousas (Louisiana) | 5,526.73 mi (8,894.42 km) |
| Rocca Priora to Orange (California) | 6,346.80 mi (10,214.18 km) |
| Rocca Priora to Orange (Texas) | 5,618.67 mi (9,042.38 km) |
| Rocca Priora to Orange City (Florida) | 5,110.47 mi (8,224.51 km) |
| Rocca Priora to Orangeburg (South Carolina) | 4,894.26 mi (7,876.55 km) |
