| Clearfield to Olympia Heights (Florida) | 2,096.56 mi (3,374.08 km) |
| Clearfield to Omaha (Nebraska) | 829.40 mi (1,334.78 km) |
| Clearfield to On Top of the World Designated Place (Florida) | 1,861.60 mi (2,995.95 km) |
| Clearfield to Onalaska (Wisconsin) | 1,074.80 mi (1,729.72 km) |
| Clearfield to Oneida (New York) | 1,854.75 mi (2,984.94 km) |
| Clearfield to Oneonta (New York) | 1,891.39 mi (3,043.89 km) |
| Clearfield to Ontario (California) | 575.59 mi (926.33 km) |
| Clearfield to Ontario (Oregon) | 322.84 mi (519.56 km) |
| Clearfield to Opa-locka (Florida) | 2,093.12 mi (3,368.56 km) |
| Clearfield to Opelika (Alabama) | 1,576.11 mi (2,536.50 km) |
| Clearfield to Opelousas (Louisiana) | 1,330.09 mi (2,140.58 km) |
| Clearfield to Orange (California) | 595.88 mi (958.97 km) |
| Clearfield to Orange (Texas) | 1,271.50 mi (2,046.28 km) |
| Clearfield to Orange City (Florida) | 1,918.08 mi (3,086.85 km) |
| Clearfield to Orangeburg (South Carolina) | 1,780.53 mi (2,865.48 km) |
