| Rockford to Devnya | 5,345.44 mi (8,602.66 km) |
| Rockford to Dimitrovgrad | 5,335.88 mi (8,587.27 km) |
| Rockford to Dobrich | 5,336.72 mi (8,588.62 km) |
| Rockford to Dospat | 5,304.57 mi (8,536.88 km) |
| Rockford to Dupnitsa | 5,236.49 mi (8,427.32 km) |
| Rockford to Elhovo | 5,364.03 mi (8,632.57 km) |
| Rockford to Etropole | 5,240.24 mi (8,433.36 km) |
| Rockford to Gabrovo | 5,285.72 mi (8,506.54 km) |
| Rockford to Gorna Oryahovitsa | 5,285.25 mi (8,505.78 km) |
| Rockford to Gotse Delchev | 5,293.01 mi (8,518.27 km) |
| Rockford to Harmanli | 5,352.34 mi (8,613.76 km) |
| Rockford to Haskovo | 5,340.54 mi (8,594.77 km) |
| Rockford to Ihtiman | 5,253.16 mi (8,454.14 km) |
| Rockford to Isperih | 5,295.10 mi (8,521.64 km) |
| Rockford to Kardzhali | 5,347.60 mi (8,606.13 km) |
