| Tulcea to Oakley (California) | 6,403.23 mi (10,305.00 km) |
| Tulcea to Oakton (Virginia) | 5,040.14 mi (8,111.31 km) |
| Tulcea to Oakville (Missouri) | 5,531.93 mi (8,902.78 km) |
| Tulcea to Oatfield (Oregon) | 5,937.46 mi (9,555.42 km) |
| Tulcea to Ocala (Florida) | 5,718.87 mi (9,203.63 km) |
| Tulcea to Ocean Acres (New Jersey) | 4,883.12 mi (7,858.62 km) |
| Tulcea to Ocean City (New Jersey) | 4,918.13 mi (7,914.96 km) |
| Tulcea to Ocean Pines (Maryland) | 4,981.60 mi (8,017.11 km) |
| Tulcea to Ocean Pointe (Hawaii) | 7,821.69 mi (12,587.80 km) |
| Tulcea to Ocean Springs (Mississippi) | 5,910.79 mi (9,512.49 km) |
| Tulcea to Oceanside (California) | 6,617.55 mi (10,649.92 km) |
| Tulcea to Oceanside (New York) | 4,816.30 mi (7,751.09 km) |
| Tulcea to Ocoee (Florida) | 5,724.91 mi (9,213.35 km) |
| Tulcea to Oconomowoc (Wisconsin) | 5,223.13 mi (8,405.82 km) |
| Tulcea to Odenton (Maryland) | 5,008.32 mi (8,060.11 km) |
