| Holt to Oakley (California) | 1,967.87 mi (3,166.98 km) |
| Holt to Oakton (Virginia) | 458.38 mi (737.68 km) |
| Holt to Oakville (Missouri) | 419.74 mi (675.50 km) |
| Holt to Oatfield (Oregon) | 1,882.85 mi (3,030.16 km) |
| Holt to Ocala (Florida) | 939.62 mi (1,512.17 km) |
| Holt to Ocean Acres (New Jersey) | 568.87 mi (915.50 km) |
| Holt to Ocean City (New Jersey) | 567.64 mi (913.52 km) |
| Holt to Ocean Pines (Maryland) | 573.40 mi (922.80 km) |
| Holt to Ocean Pointe (Hawaii) | 4,410.89 mi (7,098.65 km) |
| Holt to Ocean Springs (Mississippi) | 877.32 mi (1,411.91 km) |
| Holt to Oceanside (California) | 1,886.86 mi (3,036.60 km) |
| Holt to Oceanside (New York) | 578.98 mi (931.77 km) |
| Holt to Ocoee (Florida) | 985.89 mi (1,586.63 km) |
| Holt to Oconomowoc (Wisconsin) | 203.19 mi (327.00 km) |
| Holt to Odenton (Maryland) | 478.00 mi (769.27 km) |
