| Somerville to Olympia (Washington) | 2,516.37 mi (4,049.71 km) |
| Somerville to Olympia Heights (Florida) | 1,265.23 mi (2,036.19 km) |
| Somerville to Omaha (Nebraska) | 1,282.39 mi (2,063.81 km) |
| Somerville to On Top of the World Designated Place (Florida) | 1,109.51 mi (1,785.58 km) |
| Somerville to Onalaska (Wisconsin) | 1,016.41 mi (1,635.76 km) |
| Somerville to Oneida (New York) | 236.23 mi (380.18 km) |
| Somerville to Oneonta (New York) | 202.27 mi (325.52 km) |
| Somerville to Ontario (California) | 2,556.52 mi (4,114.32 km) |
| Somerville to Ontario (Oregon) | 2,282.93 mi (3,674.03 km) |
| Somerville to Opa-locka (Florida) | 1,252.02 mi (2,014.94 km) |
| Somerville to Opelika (Alabama) | 1,028.87 mi (1,655.80 km) |
| Somerville to Opelousas (Louisiana) | 1,418.87 mi (2,283.44 km) |
| Somerville to Orange (California) | 2,574.94 mi (4,143.97 km) |
| Somerville to Orange (Texas) | 1,512.95 mi (2,434.86 km) |
| Somerville to Orange City (Florida) | 1,089.61 mi (1,753.55 km) |
