| Grayslake to Nyon | 4,372.00 mi (7,036.06 km) |
| Grayslake to Oberriet | 4,463.82 mi (7,183.83 km) |
| Grayslake to Obersiggenthal | 4,408.43 mi (7,094.69 km) |
| Grayslake to Oberwil | 4,379.13 mi (7,047.52 km) |
| Grayslake to Oberwingert | 4,425.43 mi (7,122.05 km) |
| Grayslake to Oftringen | 4,400.79 mi (7,082.38 km) |
| Grayslake to Olten | 4,398.83 mi (7,079.23 km) |
| Grayslake to Onex | 4,374.56 mi (7,040.17 km) |
| Grayslake to Opfikon | 4,421.05 mi (7,115.00 km) |
| Grayslake to Ostermundigen | 4,398.59 mi (7,078.85 km) |
| Grayslake to Payerne | 4,382.44 mi (7,052.86 km) |
| Grayslake to Pfaffikon | 4,431.98 mi (7,132.59 km) |
| Grayslake to Plan-les-Ouates | 4,375.86 mi (7,042.27 km) |
| Grayslake to Pratteln | 4,384.58 mi (7,056.30 km) |
| Grayslake to Prilly | 4,380.53 mi (7,049.79 km) |
