| Ontario to Portage (Michigan) | 1,816.99 mi (2,924.16 km) |
| Ontario to Portage (Wisconsin) | 1,641.44 mi (2,641.65 km) |
| Ontario to Portales (New Mexico) | 814.61 mi (1,310.98 km) |
| Ontario to Porterville (California) | 161.53 mi (259.96 km) |
| Ontario to Portland (Maine) | 2,595.03 mi (4,176.30 km) |
| Ontario to Portland (Oregon) | 837.88 mi (1,348.44 km) |
| Ontario to Portland (Tennessee) | 1,753.60 mi (2,822.15 km) |
| Ontario to Portland (Texas) | 1,271.51 mi (2,046.30 km) |
| Ontario to Portsmouth (New Hampshire) | 2,570.74 mi (4,137.21 km) |
| Ontario to Portsmouth (Ohio) | 1,943.20 mi (3,127.28 km) |
| Ontario to Portsmouth (Virginia) | 2,312.22 mi (3,721.16 km) |
| Ontario to Post Falls (Idaho) | 945.97 mi (1,522.39 km) |
| Ontario to Potomac (Maryland) | 2,251.29 mi (3,623.09 km) |
| Ontario to Potomac Park (California) | 119.70 mi (192.63 km) |
| Ontario to Pottstown (Pennsylvania) | 2,328.38 mi (3,747.17 km) |
