| Round Rock to Norwich | 4,919.43 mi (7,917.06 km) |
| Round Rock to Nottingham | 4,817.48 mi (7,752.99 km) |
| Round Rock to Nuneaton | 4,817.49 mi (7,753.01 km) |
| Round Rock to Oadby | 4,830.36 mi (7,773.71 km) |
| Round Rock to Oakengates | 4,774.95 mi (7,684.55 km) |
| Round Rock to Oakham | 4,841.40 mi (7,791.47 km) |
| Round Rock to Oldbury | 4,796.94 mi (7,719.92 km) |
| Round Rock to Oldham | 4,764.46 mi (7,667.65 km) |
| Round Rock to Ollerton | 4,815.43 mi (7,749.68 km) |
| Round Rock to Olton | 4,806.90 mi (7,735.96 km) |
| Round Rock to Omagh | 4,542.84 mi (7,311.00 km) |
| Round Rock to Ormesby | 4,771.66 mi (7,679.24 km) |
| Round Rock to Ormskirk | 4,734.77 mi (7,619.87 km) |
| Round Rock to Orpington | 4,911.37 mi (7,904.08 km) |
| Round Rock to Ossett | 4,780.92 mi (7,694.15 km) |
