| Catonsville to Hoyo de Manzanares | 3,743.07 mi (6,023.90 km) |
| Catonsville to Huelva | 3,690.83 mi (5,939.81 km) |
| Catonsville to Huercal de Almeria | 3,925.55 mi (6,317.56 km) |
| Catonsville to Huercal-Overa | 3,934.41 mi (6,331.82 km) |
| Catonsville to Huesca | 3,863.84 mi (6,218.25 km) |
| Catonsville to Huetor Vega | 3,861.42 mi (6,214.36 km) |
| Catonsville to Huetor-Tajar | 3,836.39 mi (6,174.07 km) |
| Catonsville to Humanes de Madrid | 3,756.52 mi (6,045.53 km) |
| Catonsville to Ibi | 3,961.57 mi (6,375.53 km) |
| Catonsville to Ibiza | 4,049.04 mi (6,516.30 km) |
| Catonsville to Icod de los Vinos | 3,464.99 mi (5,576.36 km) |
| Catonsville to Igualada | 3,974.92 mi (6,397.01 km) |
| Catonsville to Illescas | 3,760.18 mi (6,051.42 km) |
| Catonsville to Inca | 4,093.64 mi (6,588.07 km) |
| Catonsville to Ingenio | 3,546.83 mi (5,708.07 km) |
