| Rietberg to Olympia Heights (Florida) | 4,790.05 mi (7,708.84 km) |
| Rietberg to Omaha (Nebraska) | 4,580.66 mi (7,371.86 km) |
| Rietberg to On Top of the World Designated Place (Florida) | 4,694.65 mi (7,555.32 km) |
| Rietberg to Onalaska (Wisconsin) | 4,280.70 mi (6,889.12 km) |
| Rietberg to Oneida (New York) | 3,753.47 mi (6,040.63 km) |
| Rietberg to Oneonta (New York) | 3,758.72 mi (6,049.07 km) |
| Rietberg to Ontario (California) | 5,668.75 mi (9,122.98 km) |
| Rietberg to Ontario (Oregon) | 5,059.74 mi (8,142.87 km) |
| Rietberg to Opa-locka (Florida) | 4,777.50 mi (7,688.65 km) |
| Rietberg to Opelika (Alabama) | 4,634.51 mi (7,458.53 km) |
| Rietberg to Opelousas (Louisiana) | 5,004.15 mi (8,053.41 km) |
| Rietberg to Orange (California) | 5,689.03 mi (9,155.61 km) |
| Rietberg to Orange (Texas) | 5,089.14 mi (8,190.18 km) |
| Rietberg to Orange City (Florida) | 4,663.13 mi (7,504.58 km) |
| Rietberg to Orangeburg (South Carolina) | 4,414.98 mi (7,105.22 km) |
