| Most to Oakley (California) | 5,748.10 mi (9,250.68 km) |
| Most to Oakton (Virginia) | 4,252.89 mi (6,844.37 km) |
| Most to Oakville (Missouri) | 4,761.88 mi (7,663.51 km) |
| Most to Oatfield (Oregon) | 5,311.33 mi (8,547.75 km) |
| Most to Ocala (Florida) | 4,928.08 mi (7,930.97 km) |
| Most to Ocean Acres (New Jersey) | 4,094.53 mi (6,589.50 km) |
| Most to Ocean City (New Jersey) | 4,129.32 mi (6,645.50 km) |
| Most to Ocean Pines (Maryland) | 4,192.41 mi (6,747.03 km) |
| Most to Ocean Pointe (Hawaii) | 7,448.63 mi (11,987.42 km) |
| Most to Ocean Springs (Mississippi) | 5,125.51 mi (8,248.71 km) |
| Most to Oceanside (California) | 5,924.66 mi (9,534.82 km) |
| Most to Oceanside (New York) | 4,028.12 mi (6,482.64 km) |
| Most to Ocoee (Florida) | 4,933.86 mi (7,940.28 km) |
| Most to Oconomowoc (Wisconsin) | 4,460.29 mi (7,178.14 km) |
| Most to Odenton (Maryland) | 4,220.78 mi (6,792.69 km) |
