| Penarth to Indianola (Iowa) | 4,083.89 mi (6,572.39 km) |
| Penarth to Indio (California) | 5,295.31 mi (8,521.98 km) |
| Penarth to Inglewood (California) | 5,353.55 mi (8,615.70 km) |
| Penarth to Inkster (Michigan) | 3,645.82 mi (5,867.38 km) |
| Penarth to Inver Grove Heights (Minnesota) | 3,903.44 mi (6,281.98 km) |
| Penarth to Inwood (New York) | 3,331.15 mi (5,360.97 km) |
| Penarth to Iona (Florida) | 4,337.23 mi (6,980.09 km) |
| Penarth to Ionia (Michigan) | 3,684.56 mi (5,929.73 km) |
| Penarth to Iowa City (Iowa) | 3,993.07 mi (6,426.22 km) |
| Penarth to Irmo (South Carolina) | 3,934.42 mi (6,331.83 km) |
| Penarth to Irondale (Alabama) | 4,186.89 mi (6,738.15 km) |
| Penarth to Ironton (Ohio) | 3,789.04 mi (6,097.87 km) |
| Penarth to Irvine (California) | 5,350.30 mi (8,610.48 km) |
| Penarth to Irving (Texas) | 4,634.59 mi (7,458.65 km) |
| Penarth to Isabela (Puerto Rico) | 4,106.02 mi (6,608.00 km) |
