| Castelldefels to Marysville (California) | 5,844.20 mi (9,405.33 km) |
| Castelldefels to Marysville (Ohio) | 4,269.16 mi (6,870.55 km) |
| Castelldefels to Marysville (Washington) | 5,384.09 mi (8,664.86 km) |
| Castelldefels to Maryville (Missouri) | 4,765.59 mi (7,669.48 km) |
| Castelldefels to Maryville (Tennessee) | 4,465.60 mi (7,186.69 km) |
| Castelldefels to Mason (Ohio) | 4,343.57 mi (6,990.30 km) |
| Castelldefels to Mason City (Iowa) | 4,581.85 mi (7,373.77 km) |
| Castelldefels to Massapequa (New York) | 3,802.15 mi (6,118.97 km) |
| Castelldefels to Massapequa Park (New York) | 3,800.72 mi (6,116.67 km) |
| Castelldefels to Massillon (Ohio) | 4,166.87 mi (6,705.93 km) |
| Castelldefels to Mastic (New York) | 3,768.68 mi (6,065.10 km) |
| Castelldefels to Mastic Beach (New York) | 3,769.52 mi (6,066.46 km) |
| Castelldefels to Matteson (Illinois) | 4,415.00 mi (7,105.25 km) |
| Castelldefels to Matthews (North Carolina) | 4,336.01 mi (6,978.13 km) |
| Castelldefels to Mattoon (Illinois) | 4,519.87 mi (7,274.02 km) |
