| Owings Mills to Nasaud | 4,740.65 mi (7,629.33 km) |
| Owings Mills to Navodari | 5,025.66 mi (8,088.03 km) |
| Owings Mills to Negresti-Oas | 4,679.89 mi (7,531.56 km) |
| Owings Mills to Nehoiu | 4,892.64 mi (7,873.95 km) |
| Owings Mills to Ocna Mures | 4,755.45 mi (7,653.16 km) |
| Owings Mills to Odobesti | 4,904.61 mi (7,893.21 km) |
| Owings Mills to Odorheiu Secuiesc | 4,814.22 mi (7,747.74 km) |
| Owings Mills to Oltenita | 4,958.77 mi (7,980.37 km) |
| Owings Mills to Onesti | 4,872.65 mi (7,841.77 km) |
| Owings Mills to Oradea | 4,653.16 mi (7,488.54 km) |
| Owings Mills to Orastie | 4,751.29 mi (7,646.46 km) |
| Owings Mills to Oravita | 4,723.21 mi (7,601.28 km) |
| Owings Mills to Orsova | 4,764.20 mi (7,667.25 km) |
| Owings Mills to Otelu Rosu | 4,730.99 mi (7,613.80 km) |
| Owings Mills to Otopeni | 4,917.06 mi (7,913.24 km) |
