| Port Huron to Romeoville (Illinois) | 303.86 mi (489.02 km) |
| Port Huron to Romulus (Michigan) | 70.49 mi (113.45 km) |
| Port Huron to Ronkonkoma (New York) | 501.82 mi (807.61 km) |
| Port Huron to Roosevelt (New York) | 482.55 mi (776.59 km) |
| Port Huron to Rosamond (California) | 1,986.50 mi (3,196.97 km) |
| Port Huron to Rosaryville (Maryland) | 413.07 mi (664.77 km) |
| Port Huron to Roscoe (Illinois) | 335.69 mi (540.24 km) |
| Port Huron to Rose Hill (Virginia) | 401.74 mi (646.54 km) |
| Port Huron to Roseburg (Oregon) | 2,043.04 mi (3,287.96 km) |
| Port Huron to Rosedale (California) | 2,020.21 mi (3,251.21 km) |
| Port Huron to Rosedale (Maryland) | 398.54 mi (641.38 km) |
| Port Huron to Roselle (Illinois) | 295.90 mi (476.20 km) |
| Port Huron to Roselle (New Jersey) | 450.62 mi (725.21 km) |
| Port Huron to Roselle Park (New Jersey) | 449.95 mi (724.13 km) |
| Port Huron to Rosemead (California) | 2,005.54 mi (3,227.61 km) |
