| Viareggio to Navodari | 909.84 mi (1,464.25 km) |
| Viareggio to Negresti-Oas | 690.33 mi (1,110.98 km) |
| Viareggio to Nehoiu | 794.97 mi (1,279.38 km) |
| Viareggio to Ocna Mures | 684.96 mi (1,102.34 km) |
| Viareggio to Odobesti | 832.97 mi (1,340.54 km) |
| Viareggio to Odorheiu Secuiesc | 752.14 mi (1,210.45 km) |
| Viareggio to Oltenita | 813.53 mi (1,309.24 km) |
| Viareggio to Onesti | 821.30 mi (1,321.76 km) |
| Viareggio to Oradea | 606.55 mi (976.15 km) |
| Viareggio to Orastie | 648.07 mi (1,042.96 km) |
| Viareggio to Oravita | 569.26 mi (916.14 km) |
| Viareggio to Orsova | 602.98 mi (970.40 km) |
| Viareggio to Otelu Rosu | 604.66 mi (973.11 km) |
| Viareggio to Otopeni | 783.67 mi (1,261.19 km) |
| Viareggio to Ovidiu | 907.49 mi (1,460.47 km) |
