| Olgiate Comasco to Olympia Heights (Florida) | 4,934.38 mi (7,941.11 km) |
| Olgiate Comasco to Omaha (Nebraska) | 4,858.38 mi (7,818.81 km) |
| Olgiate Comasco to On Top of the World Designated Place (Florida) | 4,864.82 mi (7,829.17 km) |
| Olgiate Comasco to Onalaska (Wisconsin) | 4,554.33 mi (7,329.48 km) |
| Olgiate Comasco to Oneida (New York) | 3,973.43 mi (6,394.63 km) |
| Olgiate Comasco to Oneonta (New York) | 3,973.00 mi (6,393.92 km) |
| Olgiate Comasco to Ontario (California) | 5,993.20 mi (9,645.12 km) |
| Olgiate Comasco to Ontario (Oregon) | 5,406.02 mi (8,700.15 km) |
| Olgiate Comasco to Opa-locka (Florida) | 4,922.33 mi (7,921.72 km) |
| Olgiate Comasco to Opelika (Alabama) | 4,835.27 mi (7,781.61 km) |
| Olgiate Comasco to Opelousas (Louisiana) | 5,222.56 mi (8,404.90 km) |
| Olgiate Comasco to Orange (California) | 6,013.60 mi (9,677.95 km) |
| Olgiate Comasco to Orange (Texas) | 5,312.71 mi (8,549.99 km) |
| Olgiate Comasco to Orange City (Florida) | 4,828.02 mi (7,769.95 km) |
| Olgiate Comasco to Orangeburg (South Carolina) | 4,601.44 mi (7,405.30 km) |
