| Marsa to Olympia Heights (Florida) | 5,449.93 mi (8,770.82 km) |
| Marsa to Omaha (Nebraska) | 5,530.86 mi (8,901.06 km) |
| Marsa to On Top of the World Designated Place (Florida) | 5,415.12 mi (8,714.80 km) |
| Marsa to Onalaska (Wisconsin) | 5,225.00 mi (8,408.82 km) |
| Marsa to Oneida (New York) | 4,594.92 mi (7,394.82 km) |
| Marsa to Oneonta (New York) | 4,588.33 mi (7,384.20 km) |
| Marsa to Ontario (California) | 6,702.68 mi (10,786.93 km) |
| Marsa to Ontario (Oregon) | 6,133.04 mi (9,870.18 km) |
| Marsa to Opa-locka (Florida) | 5,438.75 mi (8,752.82 km) |
| Marsa to Opelika (Alabama) | 5,423.77 mi (8,728.72 km) |
| Marsa to Opelousas (Louisiana) | 5,827.44 mi (9,378.36 km) |
| Marsa to Orange (California) | 6,723.11 mi (10,819.80 km) |
| Marsa to Orange (Texas) | 5,922.69 mi (9,531.65 km) |
| Marsa to Orange City (Florida) | 5,372.17 mi (8,645.68 km) |
| Marsa to Orangeburg (South Carolina) | 5,175.89 mi (8,329.78 km) |
