| Rock Island to Devnya | 5,438.05 mi (8,751.69 km) |
| Rock Island to Dimitrovgrad | 5,429.19 mi (8,737.43 km) |
| Rock Island to Dobrich | 5,429.17 mi (8,737.41 km) |
| Rock Island to Dospat | 5,398.22 mi (8,687.59 km) |
| Rock Island to Dupnitsa | 5,330.18 mi (8,578.10 km) |
| Rock Island to Elhovo | 5,457.12 mi (8,782.39 km) |
| Rock Island to Etropole | 5,333.65 mi (8,583.68 km) |
| Rock Island to Gabrovo | 5,378.87 mi (8,656.45 km) |
| Rock Island to Gorna Oryahovitsa | 5,378.26 mi (8,655.48 km) |
| Rock Island to Gotse Delchev | 5,386.75 mi (8,669.13 km) |
| Rock Island to Harmanli | 5,445.61 mi (8,763.86 km) |
| Rock Island to Haskovo | 5,433.88 mi (8,744.98 km) |
| Rock Island to Ihtiman | 5,346.69 mi (8,604.67 km) |
| Rock Island to Isperih | 5,387.73 mi (8,670.71 km) |
| Rock Island to Kardzhali | 5,441.04 mi (8,756.51 km) |
