| Hertford to Glyka Nera | 1,498.26 mi (2,411.21 km) |
| Hertford to Grevena | 1,303.94 mi (2,098.49 km) |
| Hertford to Ialysos | 1,739.52 mi (2,799.48 km) |
| Hertford to Ilion | 1,490.67 mi (2,399.00 km) |
| Hertford to Ilioupoli | 1,497.60 mi (2,410.15 km) |
| Hertford to Ioannina | 1,303.85 mi (2,098.34 km) |
| Hertford to Irakleio | 1,683.06 mi (2,708.62 km) |
| Hertford to Irakleio | 1,492.28 mi (2,401.60 km) |
| Hertford to Kaisariani | 1,496.12 mi (2,407.78 km) |
| Hertford to Kalamaria | 1,337.29 mi (2,152.16 km) |
| Hertford to Kalamata | 1,485.17 mi (2,390.15 km) |
| Hertford to Kallithea | 1,494.90 mi (2,405.81 km) |
| Hertford to Kalymnos | 1,666.37 mi (2,681.76 km) |
| Hertford to Kalyvia Thorikou | 1,508.83 mi (2,428.23 km) |
| Hertford to Kamatero | 1,489.77 mi (2,397.56 km) |
