| Idar-Oberstein to Oakley (California) | 5,627.19 mi (9,056.09 km) |
| Idar-Oberstein to Oakton (Virginia) | 4,025.08 mi (6,477.74 km) |
| Idar-Oberstein to Oakville (Missouri) | 4,558.84 mi (7,336.74 km) |
| Idar-Oberstein to Oatfield (Oregon) | 5,209.81 mi (8,384.38 km) |
| Idar-Oberstein to Ocala (Florida) | 4,687.43 mi (7,543.69 km) |
| Idar-Oberstein to Ocean Acres (New Jersey) | 3,863.55 mi (6,217.79 km) |
| Idar-Oberstein to Ocean City (New Jersey) | 3,897.68 mi (6,272.71 km) |
| Idar-Oberstein to Ocean Pines (Maryland) | 3,959.48 mi (6,372.16 km) |
| Idar-Oberstein to Ocean Pointe (Hawaii) | 7,447.59 mi (11,985.74 km) |
| Idar-Oberstein to Ocean Springs (Mississippi) | 4,900.29 mi (7,886.26 km) |
| Idar-Oberstein to Oceanside (California) | 5,779.57 mi (9,301.31 km) |
| Idar-Oberstein to Oceanside (New York) | 3,798.40 mi (6,112.93 km) |
| Idar-Oberstein to Ocoee (Florida) | 4,690.94 mi (7,549.34 km) |
| Idar-Oberstein to Oconomowoc (Wisconsin) | 4,266.08 mi (6,865.59 km) |
| Idar-Oberstein to Odenton (Maryland) | 3,992.33 mi (6,425.03 km) |
