| Greenock to Oakley (California) | 4,969.90 mi (7,998.28 km) |
| Greenock to Oakton (Virginia) | 3,412.24 mi (5,491.48 km) |
| Greenock to Oakville (Missouri) | 3,916.84 mi (6,303.55 km) |
| Greenock to Oatfield (Oregon) | 4,560.83 mi (7,339.95 km) |
| Greenock to Ocala (Florida) | 4,096.52 mi (6,592.72 km) |
| Greenock to Ocean Acres (New Jersey) | 3,256.06 mi (5,240.12 km) |
| Greenock to Ocean City (New Jersey) | 3,291.27 mi (5,296.79 km) |
| Greenock to Ocean Pines (Maryland) | 3,355.21 mi (5,399.69 km) |
| Greenock to Ocean Pointe (Hawaii) | 6,873.32 mi (11,061.54 km) |
| Greenock to Ocean Springs (Mississippi) | 4,282.87 mi (6,892.61 km) |
| Greenock to Oceanside (California) | 5,117.95 mi (8,236.55 km) |
| Greenock to Oceanside (New York) | 3,188.91 mi (5,132.06 km) |
| Greenock to Ocoee (Florida) | 4,104.77 mi (6,605.99 km) |
| Greenock to Oconomowoc (Wisconsin) | 3,617.35 mi (5,821.56 km) |
| Greenock to Odenton (Maryland) | 3,380.54 mi (5,440.45 km) |
