| Holt to Odessa (Texas) | 1,225.52 mi (1,972.28 km) |
| Holt to Ogden (Utah) | 1,407.44 mi (2,265.05 km) |
| Holt to Oildale (California) | 1,902.98 mi (3,062.54 km) |
| Holt to Ojus (Florida) | 1,179.07 mi (1,897.53 km) |
| Holt to Okemos (Michigan) | 7.42 mi (11.95 km) |
| Holt to Oklahoma City (Oklahoma) | 853.35 mi (1,373.33 km) |
| Holt to Okmulgee (Oklahoma) | 782.45 mi (1,259.24 km) |
| Holt to Olathe (Kansas) | 597.25 mi (961.18 km) |
| Holt to Old Jamestown (Missouri) | 399.51 mi (642.95 km) |
| Holt to Oldsmar (Florida) | 1,013.51 mi (1,631.08 km) |
| Holt to Olean (New York) | 313.68 mi (504.82 km) |
| Holt to Olive Branch (Mississippi) | 602.64 mi (969.85 km) |
| Holt to Olivehurst (California) | 1,934.78 mi (3,113.72 km) |
| Holt to Olney (Maryland) | 458.10 mi (737.24 km) |
| Holt to Olympia (Washington) | 1,884.58 mi (3,032.94 km) |
