| Round Rock to Nyon | 5,319.92 mi (8,561.59 km) |
| Round Rock to Oberriet | 5,419.62 mi (8,722.03 km) |
| Round Rock to Obersiggenthal | 5,363.01 mi (8,630.93 km) |
| Round Rock to Oberwil | 5,332.77 mi (8,582.27 km) |
| Round Rock to Oberwingert | 5,380.74 mi (8,659.47 km) |
| Round Rock to Oftringen | 5,354.32 mi (8,616.94 km) |
| Round Rock to Olten | 5,352.44 mi (8,613.92 km) |
| Round Rock to Onex | 5,321.55 mi (8,564.20 km) |
| Round Rock to Opfikon | 5,375.84 mi (8,651.58 km) |
| Round Rock to Ostermundigen | 5,350.36 mi (8,610.57 km) |
| Round Rock to Payerne | 5,332.93 mi (8,582.53 km) |
| Round Rock to Pfaffikon | 5,386.86 mi (8,669.32 km) |
| Round Rock to Plan-les-Ouates | 5,322.82 mi (8,566.25 km) |
| Round Rock to Pratteln | 5,338.44 mi (8,591.38 km) |
| Round Rock to Prilly | 5,329.55 mi (8,577.08 km) |
