| Roman to Oakley (California) | 6,257.21 mi (10,070.00 km) |
| Roman to Oakton (Virginia) | 4,895.64 mi (7,878.77 km) |
| Roman to Oakville (Missouri) | 5,383.42 mi (8,663.78 km) |
| Roman to Oatfield (Oregon) | 5,793.58 mi (9,323.87 km) |
| Roman to Ocala (Florida) | 5,577.32 mi (8,975.83 km) |
| Roman to Ocean Acres (New Jersey) | 4,739.41 mi (7,627.34 km) |
| Roman to Ocean City (New Jersey) | 4,774.55 mi (7,683.90 km) |
| Roman to Ocean Pines (Maryland) | 4,838.30 mi (7,786.49 km) |
| Roman to Ocean Pointe (Hawaii) | 7,711.41 mi (12,410.32 km) |
| Roman to Ocean Springs (Mississippi) | 5,765.30 mi (9,278.36 km) |
| Roman to Oceanside (California) | 6,469.08 mi (10,410.97 km) |
| Roman to Oceanside (New York) | 4,672.35 mi (7,519.41 km) |
| Roman to Ocoee (Florida) | 5,584.07 mi (8,986.70 km) |
| Roman to Oconomowoc (Wisconsin) | 5,074.01 mi (8,165.83 km) |
| Roman to Odenton (Maryland) | 4,863.98 mi (7,827.82 km) |
