| Gretna to Noventa Vicentina | 5,292.11 mi (8,516.83 km) |
| Gretna to Novi di Modena | 5,278.22 mi (8,494.48 km) |
| Gretna to Novi Ligure | 5,191.29 mi (8,354.57 km) |
| Gretna to Nuoro | 5,361.16 mi (8,627.96 km) |
| Gretna to Occhiobello | 5,306.36 mi (8,539.76 km) |
| Gretna to Oderzo | 5,315.65 mi (8,554.72 km) |
| Gretna to Oggiono | 5,182.75 mi (8,340.83 km) |
| Gretna to Olbia | 5,348.80 mi (8,608.07 km) |
| Gretna to Oleggio | 5,157.92 mi (8,300.88 km) |
| Gretna to Olgiate Comasco | 5,166.38 mi (8,314.49 km) |
| Gretna to Olgiate Olona | 5,167.59 mi (8,316.44 km) |
| Gretna to Omegna | 5,139.43 mi (8,271.11 km) |
| Gretna to Opera | 5,189.90 mi (8,352.34 km) |
| Gretna to Oppeano | 5,276.68 mi (8,492.00 km) |
| Gretna to Orbassano | 5,129.08 mi (8,254.46 km) |
