| Costa Mesa to Oakley (California) | 366.29 mi (589.48 km) |
| Costa Mesa to Oakton (Virginia) | 2,271.75 mi (3,656.04 km) |
| Costa Mesa to Oakville (Missouri) | 1,570.04 mi (2,526.74 km) |
| Costa Mesa to Oatfield (Oregon) | 848.61 mi (1,365.71 km) |
| Costa Mesa to Ocala (Florida) | 2,120.66 mi (3,412.87 km) |
| Costa Mesa to Ocean Acres (New Jersey) | 2,428.89 mi (3,908.92 km) |
| Costa Mesa to Ocean City (New Jersey) | 2,414.28 mi (3,885.41 km) |
| Costa Mesa to Ocean Pines (Maryland) | 2,390.37 mi (3,846.93 km) |
| Costa Mesa to Ocean Pointe (Hawaii) | 2,583.86 mi (4,158.33 km) |
| Costa Mesa to Ocean Springs (Mississippi) | 1,715.08 mi (2,760.16 km) |
| Costa Mesa to Oceanside (California) | 46.37 mi (74.62 km) |
| Costa Mesa to Oceanside (New York) | 2,458.90 mi (3,957.21 km) |
| Costa Mesa to Ocoee (Florida) | 2,169.05 mi (3,490.75 km) |
| Costa Mesa to Oconomowoc (Wisconsin) | 1,710.30 mi (2,752.47 km) |
| Costa Mesa to Odenton (Maryland) | 2,303.54 mi (3,707.19 km) |
