| Saco to Olympia (Washington) | 2,512.18 mi (4,042.97 km) |
| Saco to Olympia Heights (Florida) | 1,350.52 mi (2,173.46 km) |
| Saco to Omaha (Nebraska) | 1,309.86 mi (2,108.02 km) |
| Saco to On Top of the World Designated Place (Florida) | 1,192.13 mi (1,918.55 km) |
| Saco to Onalaska (Wisconsin) | 1,033.58 mi (1,663.39 km) |
| Saco to Oneida (New York) | 263.33 mi (423.79 km) |
| Saco to Oneonta (New York) | 244.38 mi (393.30 km) |
| Saco to Ontario (California) | 2,585.76 mi (4,161.37 km) |
| Saco to Ontario (Oregon) | 2,289.03 mi (3,683.84 km) |
| Saco to Opa-locka (Florida) | 1,337.32 mi (2,152.21 km) |
| Saco to Opelika (Alabama) | 1,102.47 mi (1,774.25 km) |
| Saco to Opelousas (Louisiana) | 1,485.82 mi (2,391.20 km) |
| Saco to Orange (California) | 2,604.47 mi (4,191.49 km) |
| Saco to Orange (Texas) | 1,578.20 mi (2,539.86 km) |
| Saco to Orange City (Florida) | 1,173.30 mi (1,888.24 km) |
