| Mackworth to Oakley (California) | 5,207.99 mi (8,381.45 km) |
| Mackworth to Oakton (Virginia) | 3,589.64 mi (5,776.98 km) |
| Mackworth to Oakville (Missouri) | 4,117.42 mi (6,626.35 km) |
| Mackworth to Oatfield (Oregon) | 4,803.21 mi (7,730.02 km) |
| Mackworth to Ocala (Florida) | 4,259.76 mi (6,855.42 km) |
| Mackworth to Ocean Acres (New Jersey) | 3,429.61 mi (5,519.42 km) |
| Mackworth to Ocean City (New Jersey) | 3,464.09 mi (5,574.92 km) |
| Mackworth to Ocean Pines (Maryland) | 3,526.62 mi (5,675.54 km) |
| Mackworth to Ocean Pointe (Hawaii) | 7,116.65 mi (11,453.14 km) |
| Mackworth to Ocean Springs (Mississippi) | 4,464.00 mi (7,184.11 km) |
| Mackworth to Oceanside (California) | 5,348.70 mi (8,607.90 km) |
| Mackworth to Oceanside (New York) | 3,363.80 mi (5,413.51 km) |
| Mackworth to Ocoee (Florida) | 4,265.03 mi (6,863.91 km) |
| Mackworth to Oconomowoc (Wisconsin) | 3,824.49 mi (6,154.92 km) |
| Mackworth to Odenton (Maryland) | 3,557.18 mi (5,724.72 km) |
