| Harker Heights to Orangevale (California) | 1,431.52 mi (2,303.81 km) |
| Harker Heights to Orchards (Washington) | 1,673.18 mi (2,692.72 km) |
| Harker Heights to Orcutt (California) | 1,343.35 mi (2,161.91 km) |
| Harker Heights to Oregon (Ohio) | 1,074.96 mi (1,729.98 km) |
| Harker Heights to Oregon (Wisconsin) | 936.93 mi (1,507.84 km) |
| Harker Heights to Oregon City (Oregon) | 1,664.51 mi (2,678.78 km) |
| Harker Heights to Orem (Utah) | 1,012.62 mi (1,629.66 km) |
| Harker Heights to Orinda (California) | 1,469.75 mi (2,365.34 km) |
| Harker Heights to Orland Park (Illinois) | 908.53 mi (1,462.13 km) |
| Harker Heights to Orlando (Florida) | 993.22 mi (1,598.43 km) |
| Harker Heights to Ormond Beach (Florida) | 994.61 mi (1,600.67 km) |
| Harker Heights to Oro Valley (Arizona) | 788.52 mi (1,269.00 km) |
| Harker Heights to Oroville (California) | 1,463.99 mi (2,356.06 km) |
| Harker Heights to Oshkosh (Wisconsin) | 1,023.23 mi (1,646.72 km) |
| Harker Heights to Oskaloosa (Iowa) | 759.89 mi (1,222.92 km) |
