| Rockville to Port Charlotte (Florida) | 883.04 mi (1,421.11 km) |
| Rockville to Port Chester (New York) | 227.24 mi (365.71 km) |
| Rockville to Port Hueneme (California) | 2,335.43 mi (3,758.51 km) |
| Rockville to Port Huron (Michigan) | 385.06 mi (619.70 km) |
| Rockville to Port Lavaca (Texas) | 1,326.43 mi (2,134.67 km) |
| Rockville to Port Neches (Texas) | 1,141.31 mi (1,836.76 km) |
| Rockville to Port Orange (Florida) | 723.49 mi (1,164.34 km) |
| Rockville to Port Orchard (Washington) | 2,325.60 mi (3,742.69 km) |
| Rockville to Port Royal (South Carolina) | 505.53 mi (813.57 km) |
| Rockville to Port Salerno (Florida) | 843.12 mi (1,356.87 km) |
| Rockville to Port St. John (Florida) | 762.19 mi (1,226.63 km) |
| Rockville to Port St. Lucie (Florida) | 836.55 mi (1,346.29 km) |
| Rockville to Port Washington (New York) | 220.10 mi (354.22 km) |
| Rockville to Port Washington (Wisconsin) | 631.10 mi (1,015.66 km) |
| Rockville to Port Wentworth (Georgia) | 527.17 mi (848.40 km) |
