| Pittsburgh to Norwich | 3,741.65 mi (6,021.60 km) |
| Pittsburgh to Nottingham | 3,638.32 mi (5,855.31 km) |
| Pittsburgh to Nuneaton | 3,636.07 mi (5,851.69 km) |
| Pittsburgh to Oadby | 3,649.69 mi (5,873.60 km) |
| Pittsburgh to Oakengates | 3,593.24 mi (5,782.76 km) |
| Pittsburgh to Oakham | 3,661.43 mi (5,892.49 km) |
| Pittsburgh to Oldbury | 3,614.85 mi (5,817.54 km) |
| Pittsburgh to Oldham | 3,586.98 mi (5,772.69 km) |
| Pittsburgh to Ollerton | 3,637.55 mi (5,854.07 km) |
| Pittsburgh to Olton | 3,624.75 mi (5,833.47 km) |
| Pittsburgh to Omagh | 3,365.35 mi (5,416.01 km) |
| Pittsburgh to Ormesby | 3,600.29 mi (5,794.11 km) |
| Pittsburgh to Ormskirk | 3,556.57 mi (5,723.74 km) |
| Pittsburgh to Orpington | 3,726.87 mi (5,997.82 km) |
| Pittsburgh to Ossett | 3,604.69 mi (5,801.19 km) |
