| Harker Heights to Oakley (California) | 1,445.51 mi (2,326.33 km) |
| Harker Heights to Oakton (Virginia) | 1,268.70 mi (2,041.78 km) |
| Harker Heights to Oakville (Missouri) | 658.03 mi (1,058.99 km) |
| Harker Heights to Oatfield (Oregon) | 1,666.86 mi (2,682.55 km) |
| Harker Heights to Ocala (Florida) | 934.25 mi (1,503.52 km) |
| Harker Heights to Ocean Acres (New Jersey) | 1,440.54 mi (2,318.33 km) |
| Harker Heights to Ocean City (New Jersey) | 1,414.58 mi (2,276.55 km) |
| Harker Heights to Ocean Pines (Maryland) | 1,369.73 mi (2,204.37 km) |
| Harker Heights to Ocean Pointe (Hawaii) | 3,759.74 mi (6,050.72 km) |
| Harker Heights to Ocean Springs (Mississippi) | 527.87 mi (849.53 km) |
| Harker Heights to Oceanside (California) | 1,158.37 mi (1,864.22 km) |
| Harker Heights to Oceanside (New York) | 1,491.91 mi (2,400.99 km) |
| Harker Heights to Ocoee (Florida) | 979.94 mi (1,577.06 km) |
| Harker Heights to Oconomowoc (Wisconsin) | 971.57 mi (1,563.59 km) |
| Harker Heights to Odenton (Maryland) | 1,303.56 mi (2,097.87 km) |
