| Olesa de Montserrat to Orangevale (California) | 5,840.17 mi (9,398.85 km) |
| Olesa de Montserrat to Orchards (Washington) | 5,505.94 mi (8,860.96 km) |
| Olesa de Montserrat to Orcutt (California) | 6,016.88 mi (9,683.23 km) |
| Olesa de Montserrat to Oregon (Ohio) | 4,207.77 mi (6,771.75 km) |
| Olesa de Montserrat to Oregon (Wisconsin) | 4,417.45 mi (7,109.20 km) |
| Olesa de Montserrat to Oregon City (Oregon) | 5,526.51 mi (8,894.06 km) |
| Olesa de Montserrat to Orem (Utah) | 5,419.38 mi (8,721.65 km) |
| Olesa de Montserrat to Orinda (California) | 5,916.20 mi (9,521.20 km) |
| Olesa de Montserrat to Orland Park (Illinois) | 4,402.59 mi (7,085.28 km) |
| Olesa de Montserrat to Orlando (Florida) | 4,616.21 mi (7,429.07 km) |
| Olesa de Montserrat to Ormond Beach (Florida) | 4,571.41 mi (7,356.97 km) |
| Olesa de Montserrat to Oro Valley (Arizona) | 5,781.97 mi (9,305.18 km) |
| Olesa de Montserrat to Oroville (California) | 5,808.11 mi (9,347.24 km) |
| Olesa de Montserrat to Oshkosh (Wisconsin) | 4,341.25 mi (6,986.56 km) |
| Olesa de Montserrat to Oskaloosa (Iowa) | 4,618.67 mi (7,433.04 km) |
