| Porsgrunn to Indianola (Iowa) | 4,242.48 mi (6,827.61 km) |
| Porsgrunn to Indio (California) | 5,315.83 mi (8,555.00 km) |
| Porsgrunn to Inglewood (California) | 5,352.80 mi (8,614.50 km) |
| Porsgrunn to Inkster (Michigan) | 3,877.42 mi (6,240.11 km) |
| Porsgrunn to Inver Grove Heights (Minnesota) | 4,032.61 mi (6,489.85 km) |
| Porsgrunn to Inwood (New York) | 3,655.48 mi (5,882.93 km) |
| Porsgrunn to Iona (Florida) | 4,719.03 mi (7,594.54 km) |
| Porsgrunn to Ionia (Michigan) | 3,895.24 mi (6,268.78 km) |
| Porsgrunn to Iowa City (Iowa) | 4,165.44 mi (6,703.62 km) |
| Porsgrunn to Irmo (South Carolina) | 4,261.44 mi (6,858.13 km) |
| Porsgrunn to Irondale (Alabama) | 4,472.99 mi (7,198.58 km) |
| Porsgrunn to Ironton (Ohio) | 4,063.30 mi (6,539.26 km) |
| Porsgrunn to Irvine (California) | 5,356.75 mi (8,620.85 km) |
| Porsgrunn to Irving (Texas) | 4,837.18 mi (7,784.68 km) |
| Porsgrunn to Isabela (Puerto Rico) | 4,658.07 mi (7,496.44 km) |
