| Austin to Olympia Heights (Florida) | 1,106.89 mi (1,781.37 km) |
| Austin to Omaha (Nebraska) | 763.33 mi (1,228.47 km) |
| Austin to On Top of the World Designated Place (Florida) | 931.10 mi (1,498.46 km) |
| Austin to Onalaska (Wisconsin) | 1,004.88 mi (1,617.19 km) |
| Austin to Oneida (New York) | 1,501.31 mi (2,416.13 km) |
| Austin to Oneonta (New York) | 1,508.21 mi (2,427.23 km) |
| Austin to Ontario (California) | 1,187.51 mi (1,911.11 km) |
| Austin to Ontario (Oregon) | 1,414.65 mi (2,276.66 km) |
| Austin to Opa-locka (Florida) | 1,107.57 mi (1,782.47 km) |
| Austin to Opelika (Alabama) | 746.73 mi (1,201.75 km) |
| Austin to Opelousas (Louisiana) | 338.21 mi (544.30 km) |
| Austin to Orange (California) | 1,197.90 mi (1,927.84 km) |
| Austin to Orange (Texas) | 238.63 mi (384.04 km) |
| Austin to Orange City (Florida) | 992.54 mi (1,597.34 km) |
| Austin to Orangeburg (South Carolina) | 1,013.49 mi (1,631.06 km) |
