| Brea to Olympia Heights (Florida) | 2,306.00 mi (3,711.16 km) |
| Brea to Omaha (Nebraska) | 1,292.73 mi (2,080.44 km) |
| Brea to On Top of the World Designated Place (Florida) | 2,111.31 mi (3,397.83 km) |
| Brea to Onalaska (Wisconsin) | 1,580.54 mi (2,543.63 km) |
| Brea to Oneida (New York) | 2,341.27 mi (3,767.92 km) |
| Brea to Oneonta (New York) | 2,371.05 mi (3,815.83 km) |
| Brea to Ontario (California) | 16.80 mi (27.04 km) |
| Brea to Ontario (Oregon) | 699.50 mi (1,125.73 km) |
| Brea to Opa-locka (Florida) | 2,306.02 mi (3,711.19 km) |
| Brea to Opelika (Alabama) | 1,870.53 mi (3,010.33 km) |
| Brea to Opelousas (Louisiana) | 1,521.17 mi (2,448.08 km) |
| Brea to Orange (California) | 8.77 mi (14.11 km) |
| Brea to Orange (Texas) | 1,432.80 mi (2,305.88 km) |
| Brea to Orange City (Florida) | 2,172.28 mi (3,495.95 km) |
| Brea to Orangeburg (South Carolina) | 2,115.04 mi (3,403.82 km) |
