| Irving to Olympia Heights (Florida) | 1,114.97 mi (1,794.37 km) |
| Irving to Omaha (Nebraska) | 582.88 mi (938.05 km) |
| Irving to On Top of the World Designated Place (Florida) | 906.70 mi (1,459.19 km) |
| Irving to Onalaska (Wisconsin) | 823.00 mi (1,324.50 km) |
| Irving to Oneida (New York) | 1,352.61 mi (2,176.82 km) |
| Irving to Oneonta (New York) | 1,363.54 mi (2,194.40 km) |
| Irving to Ontario (California) | 1,190.46 mi (1,915.86 km) |
| Irving to Ontario (Oregon) | 1,323.67 mi (2,130.24 km) |
| Irving to Opa-locka (Florida) | 1,113.45 mi (1,791.93 km) |
| Irving to Opelika (Alabama) | 673.41 mi (1,083.76 km) |
| Irving to Opelousas (Louisiana) | 329.47 mi (530.23 km) |
| Irving to Orange (California) | 1,203.44 mi (1,936.76 km) |
| Irving to Orange (Texas) | 267.34 mi (430.24 km) |
| Irving to Orange City (Florida) | 967.38 mi (1,556.85 km) |
| Irving to Orangeburg (South Carolina) | 931.36 mi (1,498.87 km) |
