| Gabrovo to Olympia Heights (Florida) | 5,754.54 mi (9,261.04 km) |
| Gabrovo to Omaha (Nebraska) | 5,575.33 mi (8,972.63 km) |
| Gabrovo to On Top of the World Designated Place (Florida) | 5,674.07 mi (9,131.53 km) |
| Gabrovo to Onalaska (Wisconsin) | 5,276.91 mi (8,492.36 km) |
| Gabrovo to Oneida (New York) | 4,749.83 mi (7,644.12 km) |
| Gabrovo to Oneonta (New York) | 4,753.77 mi (7,650.45 km) |
| Gabrovo to Ontario (California) | 6,630.32 mi (10,670.46 km) |
| Gabrovo to Ontario (Oregon) | 5,997.52 mi (9,652.08 km) |
| Gabrovo to Opa-locka (Florida) | 5,742.30 mi (9,241.34 km) |
| Gabrovo to Opelika (Alabama) | 5,626.65 mi (9,055.21 km) |
| Gabrovo to Opelousas (Louisiana) | 6,001.20 mi (9,658.00 km) |
| Gabrovo to Orange (California) | 6,650.38 mi (10,702.75 km) |
| Gabrovo to Orange (Texas) | 6,087.14 mi (9,796.31 km) |
| Gabrovo to Orange City (Florida) | 5,639.73 mi (9,076.28 km) |
| Gabrovo to Orangeburg (South Carolina) | 5,401.56 mi (8,692.98 km) |
