| Piqua to Devnya | 5,281.06 mi (8,499.05 km) |
| Piqua to Dimitrovgrad | 5,262.19 mi (8,468.67 km) |
| Piqua to Dobrich | 5,274.28 mi (8,488.14 km) |
| Piqua to Dospat | 5,225.71 mi (8,409.97 km) |
| Piqua to Dupnitsa | 5,157.20 mi (8,299.71 km) |
| Piqua to Elhovo | 5,293.28 mi (8,518.72 km) |
| Piqua to Etropole | 5,165.28 mi (8,312.71 km) |
| Piqua to Gabrovo | 5,214.28 mi (8,391.57 km) |
| Piqua to Gorna Oryahovitsa | 5,215.72 mi (8,393.89 km) |
| Piqua to Gotse Delchev | 5,212.73 mi (8,389.07 km) |
| Piqua to Harmanli | 5,279.01 mi (8,495.74 km) |
| Piqua to Haskovo | 5,266.34 mi (8,475.35 km) |
| Piqua to Ihtiman | 5,176.27 mi (8,330.40 km) |
| Piqua to Isperih | 5,230.60 mi (8,417.84 km) |
| Piqua to Kardzhali | 5,271.86 mi (8,484.23 km) |
