| Ontario to Parma Heights (Ohio) | 2,008.32 mi (3,232.07 km) |
| Ontario to Parole (Maryland) | 2,285.83 mi (3,678.69 km) |
| Ontario to Parsippany (New Jersey) | 2,390.76 mi (3,847.56 km) |
| Ontario to Pasadena (California) | 31.59 mi (50.83 km) |
| Ontario to Pasadena (Maryland) | 2,284.86 mi (3,677.13 km) |
| Ontario to Pasadena (Texas) | 1,349.34 mi (2,171.55 km) |
| Ontario to Pasadena Hills (Florida) | 2,117.69 mi (3,408.10 km) |
| Ontario to Pascagoula (Mississippi) | 1,711.74 mi (2,754.78 km) |
| Ontario to Pasco (Washington) | 847.50 mi (1,363.93 km) |
| Ontario to Passaic (New Jersey) | 2,405.67 mi (3,871.56 km) |
| Ontario to Pataskala (Ohio) | 1,955.28 mi (3,146.72 km) |
| Ontario to Patchogue (New York) | 2,464.00 mi (3,965.42 km) |
| Ontario to Paterson (New Jersey) | 2,403.69 mi (3,868.36 km) |
| Ontario to Patterson (California) | 309.68 mi (498.38 km) |
| Ontario to Pawtucket (Rhode Island) | 2,544.43 mi (4,094.86 km) |
