| Prospect Heights to Nyon | 4,378.22 mi (7,046.06 km) |
| Prospect Heights to Oberriet | 4,470.68 mi (7,194.86 km) |
| Prospect Heights to Obersiggenthal | 4,415.18 mi (7,105.54 km) |
| Prospect Heights to Oberwil | 4,385.79 mi (7,058.24 km) |
| Prospect Heights to Oberwingert | 4,432.24 mi (7,133.00 km) |
| Prospect Heights to Oftringen | 4,407.44 mi (7,093.09 km) |
| Prospect Heights to Olten | 4,405.49 mi (7,089.95 km) |
| Prospect Heights to Onex | 4,380.70 mi (7,050.06 km) |
| Prospect Heights to Opfikon | 4,427.82 mi (7,125.88 km) |
| Prospect Heights to Ostermundigen | 4,405.10 mi (7,089.33 km) |
| Prospect Heights to Payerne | 4,388.85 mi (7,063.17 km) |
| Prospect Heights to Pfaffikon | 4,438.75 mi (7,143.48 km) |
| Prospect Heights to Plan-les-Ouates | 4,382.01 mi (7,052.16 km) |
| Prospect Heights to Pratteln | 4,391.26 mi (7,067.05 km) |
| Prospect Heights to Prilly | 4,386.83 mi (7,059.92 km) |
