| North Bellport to Olympia Heights (Florida) | 1,123.88 mi (1,808.71 km) |
| North Bellport to Omaha (Nebraska) | 1,201.37 mi (1,933.42 km) |
| North Bellport to On Top of the World Designated Place (Florida) | 963.66 mi (1,550.86 km) |
| North Bellport to Onalaska (Wisconsin) | 954.85 mi (1,536.68 km) |
| North Bellport to Oneida (New York) | 211.01 mi (339.58 km) |
| North Bellport to Oneonta (New York) | 159.01 mi (255.90 km) |
| North Bellport to Ontario (California) | 2,467.68 mi (3,971.35 km) |
| North Bellport to Ontario (Oregon) | 2,230.62 mi (3,589.84 km) |
| North Bellport to Opa-locka (Florida) | 1,110.69 mi (1,787.48 km) |
| North Bellport to Opelika (Alabama) | 886.77 mi (1,427.11 km) |
| North Bellport to Opelousas (Louisiana) | 1,282.68 mi (2,064.28 km) |
| North Bellport to Orange (California) | 2,485.65 mi (4,000.27 km) |
| North Bellport to Orange (Texas) | 1,378.47 mi (2,218.44 km) |
| North Bellport to Orange City (Florida) | 944.56 mi (1,520.12 km) |
| North Bellport to Orangeburg (South Carolina) | 665.98 mi (1,071.79 km) |
