| Roman to Odessa (Texas) | 6,144.24 mi (9,888.20 km) |
| Roman to Ogden (Utah) | 5,843.99 mi (9,405.00 km) |
| Roman to Oildale (California) | 6,367.34 mi (10,247.25 km) |
| Roman to Ojus (Florida) | 5,665.18 mi (9,117.22 km) |
| Roman to Okemos (Michigan) | 4,958.87 mi (7,980.54 km) |
| Roman to Oklahoma City (Oklahoma) | 5,784.81 mi (9,309.75 km) |
| Roman to Okmulgee (Oklahoma) | 5,728.08 mi (9,218.46 km) |
| Roman to Olathe (Kansas) | 5,506.55 mi (8,861.93 km) |
| Roman to Old Jamestown (Missouri) | 5,361.04 mi (8,627.77 km) |
| Roman to Oldsmar (Florida) | 5,656.90 mi (9,103.90 km) |
| Roman to Olean (New York) | 4,780.36 mi (7,693.24 km) |
| Roman to Olive Branch (Mississippi) | 5,556.32 mi (8,942.03 km) |
| Roman to Olivehurst (California) | 6,184.39 mi (9,952.81 km) |
| Roman to Olney (Maryland) | 4,874.28 mi (7,844.39 km) |
| Roman to Olympia (Washington) | 5,693.03 mi (9,162.05 km) |
