| Monmouth to Devnya | 1,519.08 mi (2,444.72 km) |
| Monmouth to Dimitrovgrad | 1,483.78 mi (2,387.91 km) |
| Monmouth to Dobrich | 1,517.04 mi (2,441.44 km) |
| Monmouth to Dospat | 1,442.10 mi (2,320.84 km) |
| Monmouth to Dupnitsa | 1,373.50 mi (2,210.44 km) |
| Monmouth to Elhovo | 1,518.86 mi (2,444.38 km) |
| Monmouth to Etropole | 1,386.00 mi (2,230.54 km) |
| Monmouth to Gabrovo | 1,439.64 mi (2,316.87 km) |
| Monmouth to Gorna Oryahovitsa | 1,444.34 mi (2,324.43 km) |
| Monmouth to Gotse Delchev | 1,428.17 mi (2,298.41 km) |
| Monmouth to Harmanli | 1,500.95 mi (2,415.54 km) |
| Monmouth to Haskovo | 1,487.25 mi (2,393.50 km) |
| Monmouth to Ihtiman | 1,394.69 mi (2,244.53 km) |
| Monmouth to Isperih | 1,469.39 mi (2,364.76 km) |
| Monmouth to Kardzhali | 1,490.94 mi (2,399.43 km) |
