| Apex to Oakley (California) | 2,351.58 mi (3,784.51 km) |
| Apex to Oakton (Virginia) | 235.13 mi (378.41 km) |
| Apex to Oakville (Missouri) | 657.82 mi (1,058.66 km) |
| Apex to Oatfield (Oregon) | 2,358.51 mi (3,795.65 km) |
| Apex to Ocala (Florida) | 490.87 mi (789.98 km) |
| Apex to Ocean Acres (New Jersey) | 374.23 mi (602.27 km) |
| Apex to Ocean City (New Jersey) | 338.77 mi (545.20 km) |
| Apex to Ocean Pines (Maryland) | 275.66 mi (443.64 km) |
| Apex to Ocean Pointe (Hawaii) | 4,783.66 mi (7,698.56 km) |
| Apex to Ocean Springs (Mississippi) | 680.80 mi (1,095.64 km) |
| Apex to Oceanside (California) | 2,182.05 mi (3,511.67 km) |
| Apex to Oceanside (New York) | 442.51 mi (712.16 km) |
| Apex to Ocoee (Florida) | 517.47 mi (832.78 km) |
| Apex to Oconomowoc (Wisconsin) | 722.57 mi (1,162.86 km) |
| Apex to Odenton (Maryland) | 260.09 mi (418.57 km) |
