| Frederick to Oakley (California) | 2,365.18 mi (3,806.39 km) |
| Frederick to Oakton (Virginia) | 38.14 mi (61.37 km) |
| Frederick to Oakville (Missouri) | 696.30 mi (1,120.58 km) |
| Frederick to Oatfield (Oregon) | 2,309.86 mi (3,717.36 km) |
| Frederick to Ocala (Florida) | 758.11 mi (1,220.06 km) |
| Frederick to Ocean Acres (New Jersey) | 168.21 mi (270.70 km) |
| Frederick to Ocean City (New Jersey) | 150.67 mi (242.49 km) |
| Frederick to Ocean Pines (Maryland) | 141.71 mi (228.06 km) |
| Frederick to Ocean Pointe (Hawaii) | 4,810.40 mi (7,741.59 km) |
| Frederick to Ocean Springs (Mississippi) | 895.20 mi (1,440.68 km) |
| Frederick to Oceanside (California) | 2,242.95 mi (3,609.69 km) |
| Frederick to Oceanside (New York) | 216.32 mi (348.13 km) |
| Frederick to Ocoee (Florida) | 785.93 mi (1,264.82 km) |
| Frederick to Oconomowoc (Wisconsin) | 628.08 mi (1,010.80 km) |
| Frederick to Odenton (Maryland) | 46.16 mi (74.28 km) |
