| Hartlepool to Nasaud | 1,217.03 mi (1,958.62 km) |
| Hartlepool to Navodari | 1,501.77 mi (2,416.87 km) |
| Hartlepool to Negresti-Oas | 1,156.45 mi (1,861.13 km) |
| Hartlepool to Nehoiu | 1,368.89 mi (2,203.02 km) |
| Hartlepool to Ocna Mures | 1,231.96 mi (1,982.65 km) |
| Hartlepool to Odobesti | 1,380.82 mi (2,222.22 km) |
| Hartlepool to Odorheiu Secuiesc | 1,290.30 mi (2,076.54 km) |
| Hartlepool to Oltenita | 1,436.89 mi (2,312.45 km) |
| Hartlepool to Onesti | 1,349.21 mi (2,171.34 km) |
| Hartlepool to Oradea | 1,130.14 mi (1,818.78 km) |
| Hartlepool to Orastie | 1,229.81 mi (1,979.18 km) |
| Hartlepool to Oravita | 1,209.69 mi (1,946.81 km) |
| Hartlepool to Orsova | 1,250.15 mi (2,011.92 km) |
| Hartlepool to Otelu Rosu | 1,212.66 mi (1,951.59 km) |
| Hartlepool to Otopeni | 1,394.83 mi (2,244.77 km) |
