| Olesa de Montserrat to Oakley (California) | 5,893.70 mi (9,484.99 km) |
| Olesa de Montserrat to Oakton (Virginia) | 4,027.69 mi (6,481.94 km) |
| Olesa de Montserrat to Oakville (Missouri) | 4,633.52 mi (7,456.94 km) |
| Olesa de Montserrat to Oatfield (Oregon) | 5,522.75 mi (8,888.01 km) |
| Olesa de Montserrat to Ocala (Florida) | 4,627.58 mi (7,447.37 km) |
| Olesa de Montserrat to Ocean Acres (New Jersey) | 3,858.02 mi (6,208.89 km) |
| Olesa de Montserrat to Ocean City (New Jersey) | 3,888.84 mi (6,258.48 km) |
| Olesa de Montserrat to Ocean Pines (Maryland) | 3,944.37 mi (6,347.85 km) |
| Olesa de Montserrat to Ocean Pointe (Hawaii) | 7,907.32 mi (12,725.60 km) |
| Olesa de Montserrat to Ocean Springs (Mississippi) | 4,895.35 mi (7,878.30 km) |
| Olesa de Montserrat to Oceanside (California) | 5,988.98 mi (9,638.33 km) |
| Olesa de Montserrat to Oceanside (New York) | 3,799.03 mi (6,113.95 km) |
| Olesa de Montserrat to Ocoee (Florida) | 4,621.68 mi (7,437.87 km) |
| Olesa de Montserrat to Oconomowoc (Wisconsin) | 4,373.08 mi (7,037.80 km) |
| Olesa de Montserrat to Odenton (Maryland) | 3,993.29 mi (6,426.58 km) |
