| Ontario to Lombard (Illinois) | 1,690.61 mi (2,720.77 km) |
| Ontario to Lomita (California) | 44.17 mi (71.09 km) |
| Ontario to Lompoc (California) | 168.99 mi (271.96 km) |
| Ontario to London (Ohio) | 1,916.89 mi (3,084.93 km) |
| Ontario to Lone Tree (Colorado) | 799.29 mi (1,286.33 km) |
| Ontario to Long Beach (California) | 36.22 mi (58.29 km) |
| Ontario to Long Beach (Mississippi) | 1,676.67 mi (2,698.34 km) |
| Ontario to Long Beach (New York) | 2,430.92 mi (3,912.18 km) |
| Ontario to Long Branch (New Jersey) | 2,415.17 mi (3,886.84 km) |
| Ontario to Longmont (Colorado) | 807.67 mi (1,299.82 km) |
| Ontario to Longview (Texas) | 1,320.97 mi (2,125.89 km) |
| Ontario to Longview (Washington) | 882.57 mi (1,420.36 km) |
| Ontario to Longwood (Florida) | 2,159.09 mi (3,474.72 km) |
| Ontario to Lorain (Ohio) | 1,986.77 mi (3,197.40 km) |
| Ontario to Lorton (Virginia) | 2,251.72 mi (3,623.79 km) |
