| Roman to Oswego (Illinois) | 5,143.85 mi (8,278.22 km) |
| Roman to Oswego (New York) | 4,644.15 mi (7,474.04 km) |
| Roman to Otsego (Minnesota) | 5,116.98 mi (8,234.98 km) |
| Roman to Ottawa (Illinois) | 5,177.44 mi (8,332.28 km) |
| Roman to Ottawa (Kansas) | 5,536.46 mi (8,910.08 km) |
| Roman to Ottumwa (Iowa) | 5,312.16 mi (8,549.10 km) |
| Roman to Overland (Missouri) | 5,371.59 mi (8,644.75 km) |
| Roman to Overland Park (Kansas) | 5,502.12 mi (8,854.80 km) |
| Roman to Overlea (Maryland) | 4,842.72 mi (7,793.61 km) |
| Roman to Oviedo (Florida) | 5,566.20 mi (8,957.93 km) |
| Roman to Owasso (Oklahoma) | 5,684.39 mi (9,148.14 km) |
| Roman to Owatonna (Minnesota) | 5,169.51 mi (8,319.51 km) |
| Roman to Owensboro (Kentucky) | 5,310.60 mi (8,546.59 km) |
| Roman to Owings Mills (Maryland) | 4,850.72 mi (7,806.49 km) |
| Roman to Owosso (Michigan) | 4,935.96 mi (7,943.65 km) |
