| Wauwatosa to Olympia (Washington) | 1,709.18 mi (2,750.66 km) |
| Wauwatosa to Olympia Heights (Florida) | 1,274.31 mi (2,050.81 km) |
| Wauwatosa to Omaha (Nebraska) | 428.85 mi (690.17 km) |
| Wauwatosa to On Top of the World Designated Place (Florida) | 1,015.60 mi (1,634.45 km) |
| Wauwatosa to Onalaska (Wisconsin) | 169.01 mi (272.00 km) |
| Wauwatosa to Oneida (New York) | 623.93 mi (1,004.12 km) |
| Wauwatosa to Oneonta (New York) | 658.55 mi (1,059.83 km) |
| Wauwatosa to Ontario (California) | 1,704.19 mi (2,742.62 km) |
| Wauwatosa to Ontario (Oregon) | 1,443.52 mi (2,323.12 km) |
| Wauwatosa to Opa-locka (Florida) | 1,264.41 mi (2,034.86 km) |
| Wauwatosa to Opelika (Alabama) | 732.97 mi (1,179.59 km) |
| Wauwatosa to Opelousas (Louisiana) | 894.35 mi (1,439.32 km) |
| Wauwatosa to Orange (California) | 1,723.07 mi (2,773.02 km) |
| Wauwatosa to Orange (Texas) | 948.14 mi (1,525.88 km) |
| Wauwatosa to Orange City (Florida) | 1,045.47 mi (1,682.52 km) |
