| Ontario to Point Pleasant (New Jersey) | 2,412.09 mi (3,881.89 km) |
| Ontario to Pomona (California) | 9.04 mi (14.55 km) |
| Ontario to Pompano Beach (Florida) | 2,289.56 mi (3,684.70 km) |
| Ontario to Pompton Lakes (New Jersey) | 2,396.95 mi (3,857.52 km) |
| Ontario to Pompton Plains (New Jersey) | 2,395.94 mi (3,855.89 km) |
| Ontario to Ponca City (Oklahoma) | 1,169.44 mi (1,882.04 km) |
| Ontario to Ponce (Puerto Rico) | 3,316.21 mi (5,336.92 km) |
| Ontario to Pontiac (Illinois) | 1,648.91 mi (2,653.67 km) |
| Ontario to Pontiac (Michigan) | 1,937.31 mi (3,117.79 km) |
| Ontario to Pooler (Georgia) | 2,097.85 mi (3,376.16 km) |
| Ontario to Poplar Bluff (Missouri) | 1,537.78 mi (2,474.82 km) |
| Ontario to Poquoson (Virginia) | 2,309.49 mi (3,716.76 km) |
| Ontario to Port Angeles (Washington) | 1,018.32 mi (1,638.83 km) |
| Ontario to Port Arthur (Texas) | 1,414.69 mi (2,276.73 km) |
| Ontario to Port Charlotte (Florida) | 2,156.61 mi (3,470.73 km) |
