| Boise to Olympia Heights (Florida) | 2,357.60 mi (3,794.19 km) |
| Boise to Omaha (Nebraska) | 1,038.95 mi (1,672.03 km) |
| Boise to On Top of the World Designated Place (Florida) | 2,117.35 mi (3,407.55 km) |
| Boise to Onalaska (Wisconsin) | 1,244.41 mi (2,002.68 km) |
| Boise to Oneida (New York) | 2,018.42 mi (3,248.34 km) |
| Boise to Oneonta (New York) | 2,059.21 mi (3,313.98 km) |
| Boise to Ontario (California) | 664.72 mi (1,069.77 km) |
| Boise to Ontario (Oregon) | 47.37 mi (76.24 km) |
| Boise to Opa-locka (Florida) | 2,353.63 mi (3,787.80 km) |
| Boise to Opelika (Alabama) | 1,825.52 mi (2,937.88 km) |
| Boise to Opelousas (Louisiana) | 1,599.49 mi (2,574.13 km) |
| Boise to Orange (California) | 682.26 mi (1,098.00 km) |
| Boise to Orange (Texas) | 1,543.95 mi (2,484.75 km) |
| Boise to Orange City (Florida) | 2,172.44 mi (3,496.21 km) |
| Boise to Orangeburg (South Carolina) | 2,016.46 mi (3,245.18 km) |
