| Portland to Orthez | 5,328.98 mi (8,576.17 km) |
| Portland to Orvault | 5,097.83 mi (8,204.17 km) |
| Portland to Osny | 5,104.21 mi (8,214.43 km) |
| Portland to Ostwald | 5,280.65 mi (8,498.39 km) |
| Portland to Ouistreham | 5,028.27 mi (8,092.23 km) |
| Portland to Oullins | 5,366.74 mi (8,636.93 km) |
| Portland to Outreau | 5,001.00 mi (8,048.34 km) |
| Portland to Oyonnax | 5,358.94 mi (8,624.38 km) |
| Portland to Ozoir-la-Ferriere | 5,136.53 mi (8,266.44 km) |
| Portland to Pace | 5,046.25 mi (8,121.16 km) |
| Portland to Palaiseau | 5,128.27 mi (8,253.16 km) |
| Portland to Pamiers | 5,421.43 mi (8,724.95 km) |
| Portland to Panazol | 5,261.36 mi (8,467.34 km) |
| Portland to Pantin | 5,122.41 mi (8,243.72 km) |
| Portland to Paray-le-Monial | 5,306.14 mi (8,539.40 km) |
