| Gorna Oryahovitsa to Olympia Heights (Florida) | 5,761.71 mi (9,272.57 km) |
| Gorna Oryahovitsa to Omaha (Nebraska) | 5,573.34 mi (8,969.43 km) |
| Gorna Oryahovitsa to On Top of the World Designated Place (Florida) | 5,679.63 mi (9,140.48 km) |
| Gorna Oryahovitsa to Onalaska (Wisconsin) | 5,275.38 mi (8,489.91 km) |
| Gorna Oryahovitsa to Oneida (New York) | 4,752.30 mi (7,648.09 km) |
| Gorna Oryahovitsa to Oneonta (New York) | 4,756.60 mi (7,655.01 km) |
| Gorna Oryahovitsa to Ontario (California) | 6,623.63 mi (10,659.70 km) |
| Gorna Oryahovitsa to Ontario (Oregon) | 5,989.09 mi (9,638.51 km) |
| Gorna Oryahovitsa to Opa-locka (Florida) | 5,749.44 mi (9,252.82 km) |
| Gorna Oryahovitsa to Opelika (Alabama) | 5,630.22 mi (9,060.96 km) |
| Gorna Oryahovitsa to Opelousas (Louisiana) | 6,003.49 mi (9,661.69 km) |
| Gorna Oryahovitsa to Orange (California) | 6,643.66 mi (10,691.94 km) |
| Gorna Oryahovitsa to Orange (Texas) | 6,089.05 mi (9,799.38 km) |
| Gorna Oryahovitsa to Orange City (Florida) | 5,645.62 mi (9,085.75 km) |
| Gorna Oryahovitsa to Orangeburg (South Carolina) | 5,406.10 mi (8,700.27 km) |
