| Northglenn to Devnya | 5,975.33 mi (9,616.37 km) |
| Northglenn to Dimitrovgrad | 5,983.81 mi (9,630.01 km) |
| Northglenn to Dobrich | 5,962.94 mi (9,596.43 km) |
| Northglenn to Dospat | 5,962.61 mi (9,595.89 km) |
| Northglenn to Dupnitsa | 5,896.28 mi (9,489.15 km) |
| Northglenn to Elhovo | 6,005.94 mi (9,665.62 km) |
| Northglenn to Etropole | 5,891.94 mi (9,482.16 km) |
| Northglenn to Gabrovo | 5,930.09 mi (9,543.56 km) |
| Northglenn to Gorna Oryahovitsa | 5,925.99 mi (9,536.95 km) |
| Northglenn to Gotse Delchev | 5,953.83 mi (9,581.76 km) |
| Northglenn to Harmanli | 5,999.33 mi (9,654.99 km) |
| Northglenn to Haskovo | 5,989.35 mi (9,638.94 km) |
| Northglenn to Ihtiman | 5,908.25 mi (9,508.41 km) |
| Northglenn to Isperih | 5,925.99 mi (9,536.96 km) |
| Northglenn to Kardzhali | 5,999.21 mi (9,654.80 km) |
