| Fermo to Olympia Heights (Florida) | 5,216.31 mi (8,394.84 km) |
| Fermo to Omaha (Nebraska) | 5,153.83 mi (8,294.28 km) |
| Fermo to On Top of the World Designated Place (Florida) | 5,152.16 mi (8,291.60 km) |
| Fermo to Onalaska (Wisconsin) | 4,849.93 mi (7,805.20 km) |
| Fermo to Oneida (New York) | 4,268.06 mi (6,868.78 km) |
| Fermo to Oneonta (New York) | 4,267.15 mi (6,867.32 km) |
| Fermo to Ontario (California) | 6,282.57 mi (10,110.83 km) |
| Fermo to Ontario (Oregon) | 5,688.54 mi (9,154.83 km) |
| Fermo to Opa-locka (Florida) | 5,204.39 mi (8,375.66 km) |
| Fermo to Opelika (Alabama) | 5,127.41 mi (8,251.77 km) |
| Fermo to Opelousas (Louisiana) | 5,516.47 mi (8,877.90 km) |
| Fermo to Orange (California) | 6,302.95 mi (10,143.62 km) |
| Fermo to Orange (Texas) | 5,607.06 mi (9,023.69 km) |
| Fermo to Orange City (Florida) | 5,114.42 mi (8,230.86 km) |
| Fermo to Orangeburg (South Carolina) | 4,891.77 mi (7,872.55 km) |
