| Sillamae to Olympia Heights (Florida) | 5,295.73 mi (8,522.66 km) |
| Sillamae to Omaha (Nebraska) | 4,783.52 mi (7,698.33 km) |
| Sillamae to On Top of the World Designated Place (Florida) | 5,152.28 mi (8,291.79 km) |
| Sillamae to Onalaska (Wisconsin) | 4,507.38 mi (7,253.93 km) |
| Sillamae to Oneida (New York) | 4,139.15 mi (6,661.31 km) |
| Sillamae to Oneonta (New York) | 4,157.09 mi (6,690.19 km) |
| Sillamae to Ontario (California) | 5,684.04 mi (9,147.58 km) |
| Sillamae to Ontario (Oregon) | 5,015.53 mi (8,071.72 km) |
| Sillamae to Opa-locka (Florida) | 5,282.61 mi (8,501.54 km) |
| Sillamae to Opelika (Alabama) | 5,028.94 mi (8,093.30 km) |
| Sillamae to Opelousas (Louisiana) | 5,345.07 mi (8,602.06 km) |
| Sillamae to Orange (California) | 5,703.20 mi (9,178.42 km) |
| Sillamae to Orange (Texas) | 5,414.79 mi (8,714.26 km) |
| Sillamae to Orange City (Florida) | 5,132.48 mi (8,259.92 km) |
| Sillamae to Orangeburg (South Carolina) | 4,848.28 mi (7,802.55 km) |
