| New Carrollton to Orbetello | 4,399.43 mi (7,080.20 km) |
| New Carrollton to Oria | 4,752.41 mi (7,648.27 km) |
| New Carrollton to Oristano | 4,368.18 mi (7,029.90 km) |
| New Carrollton to Orta Nova | 4,637.01 mi (7,462.55 km) |
| New Carrollton to Orte | 4,450.43 mi (7,162.28 km) |
| New Carrollton to Ortona | 4,542.44 mi (7,310.35 km) |
| New Carrollton to Orvieto | 4,429.32 mi (7,128.30 km) |
| New Carrollton to Orzinuovi | 4,244.85 mi (6,831.43 km) |
| New Carrollton to Osimo | 4,462.32 mi (7,181.40 km) |
| New Carrollton to Ospitaletto | 4,245.83 mi (6,833.00 km) |
| New Carrollton to Ostuni | 4,741.29 mi (7,630.36 km) |
| New Carrollton to Ottaviano | 4,600.47 mi (7,403.74 km) |
| New Carrollton to Ovada | 4,213.67 mi (6,781.25 km) |
| New Carrollton to Ozieri | 4,363.80 mi (7,022.85 km) |
| New Carrollton to Paceco | 4,618.89 mi (7,433.38 km) |
