| Ontario to Los Alamitos (California) | 30.89 mi (49.71 km) |
| Ontario to Los Alamos (New Mexico) | 653.23 mi (1,051.27 km) |
| Ontario to Los Altos (California) | 341.05 mi (548.87 km) |
| Ontario to Los Angeles (California) | 46.10 mi (74.19 km) |
| Ontario to Los Banos (California) | 276.91 mi (445.64 km) |
| Ontario to Los Gatos (California) | 328.98 mi (529.45 km) |
| Ontario to Los Lunas (New Mexico) | 619.00 mi (996.19 km) |
| Ontario to Los Osos (California) | 202.71 mi (326.23 km) |
| Ontario to Loudoun Valley Estates (Virginia) | 2,234.80 mi (3,596.57 km) |
| Ontario to Louisville (Colorado) | 799.36 mi (1,286.45 km) |
| Ontario to Louisville (Kentucky) | 1,797.61 mi (2,892.97 km) |
| Ontario to Lovejoy (Georgia) | 1,904.54 mi (3,065.07 km) |
| Ontario to Loveland (Colorado) | 817.53 mi (1,315.69 km) |
| Ontario to Loveland (Ohio) | 1,871.68 mi (3,012.17 km) |
| Ontario to Loves Park (Illinois) | 1,646.51 mi (2,649.80 km) |
