| Olesa de Montserrat to Olympia Heights (Florida) | 4,679.67 mi (7,531.19 km) |
| Olesa de Montserrat to Omaha (Nebraska) | 4,762.18 mi (7,663.98 km) |
| Olesa de Montserrat to On Top of the World Designated Place (Florida) | 4,637.13 mi (7,462.73 km) |
| Olesa de Montserrat to Onalaska (Wisconsin) | 4,456.20 mi (7,171.55 km) |
| Olesa de Montserrat to Oneida (New York) | 3,813.75 mi (6,137.64 km) |
| Olesa de Montserrat to Oneonta (New York) | 3,806.50 mi (6,125.97 km) |
| Olesa de Montserrat to Ontario (California) | 5,957.59 mi (9,587.82 km) |
| Olesa de Montserrat to Ontario (Oregon) | 5,416.88 mi (8,717.63 km) |
| Olesa de Montserrat to Opa-locka (Florida) | 4,668.24 mi (7,512.80 km) |
| Olesa de Montserrat to Opelika (Alabama) | 4,641.37 mi (7,469.57 km) |
| Olesa de Montserrat to Opelousas (Louisiana) | 5,044.72 mi (8,118.69 km) |
| Olesa de Montserrat to Orange (California) | 5,977.98 mi (9,620.63 km) |
| Olesa de Montserrat to Orange (Texas) | 5,140.04 mi (8,272.10 km) |
| Olesa de Montserrat to Orange City (Florida) | 4,595.25 mi (7,395.33 km) |
| Olesa de Montserrat to Orangeburg (South Carolina) | 4,394.38 mi (7,072.08 km) |
