| Terni to Olympia Heights (Florida) | 5,180.94 mi (8,337.91 km) |
| Terni to Omaha (Nebraska) | 5,141.74 mi (8,274.84 km) |
| Terni to On Top of the World Designated Place (Florida) | 5,120.77 mi (8,241.08 km) |
| Terni to Onalaska (Wisconsin) | 4,837.25 mi (7,784.81 km) |
| Terni to Oneida (New York) | 4,245.97 mi (6,833.22 km) |
| Terni to Oneonta (New York) | 4,244.09 mi (6,830.20 km) |
| Terni to Ontario (California) | 6,280.65 mi (10,107.73 km) |
| Terni to Ontario (Oregon) | 5,692.81 mi (9,161.69 km) |
| Terni to Opa-locka (Florida) | 5,169.11 mi (8,318.88 km) |
| Terni to Opelika (Alabama) | 5,100.98 mi (8,209.24 km) |
| Terni to Opelousas (Louisiana) | 5,492.65 mi (8,839.57 km) |
| Terni to Orange (California) | 6,301.05 mi (10,140.55 km) |
| Terni to Orange (Texas) | 5,584.07 mi (8,986.69 km) |
| Terni to Orange City (Florida) | 5,082.26 mi (8,179.10 km) |
| Terni to Orangeburg (South Carolina) | 4,863.28 mi (7,826.70 km) |
