| Keystone to Zottegem | 4,586.39 mi (7,381.07 km) |
| Keystone to Zulte | 4,570.07 mi (7,354.82 km) |
| Keystone to Zwevegem | 4,568.08 mi (7,351.61 km) |
| Keystone to Zwijndrecht | 4,601.86 mi (7,405.98 km) |
| Keystone to Asenovgrad | 5,746.43 mi (9,247.99 km) |
| Keystone to Aytos | 5,823.13 mi (9,371.42 km) |
| Keystone to Balchik | 5,833.45 mi (9,388.03 km) |
| Keystone to Bankya | 5,646.31 mi (9,086.86 km) |
| Keystone to Bansko | 5,692.62 mi (9,161.38 km) |
| Keystone to Berkovitsa | 5,626.67 mi (9,055.25 km) |
| Keystone to Blagoevgrad | 5,668.86 mi (9,123.15 km) |
| Keystone to Botevgrad | 5,667.56 mi (9,121.06 km) |
| Keystone to Burgas | 5,839.99 mi (9,398.56 km) |
| Keystone to Byala Slatina | 5,653.47 mi (9,098.39 km) |
| Keystone to Chirpan | 5,759.53 mi (9,269.08 km) |
