| Rancho Santa Margarita to Johnstown (Pennsylvania) | 2,166.49 mi (3,486.63 km) |
| Rancho Santa Margarita to Joliet (Illinois) | 1,692.49 mi (2,723.79 km) |
| Rancho Santa Margarita to Jonesboro (Arkansas) | 1,531.31 mi (2,464.40 km) |
| Rancho Santa Margarita to Joplin (Missouri) | 1,319.72 mi (2,123.88 km) |
| Rancho Santa Margarita to Joppatowne (Maryland) | 2,304.44 mi (3,708.63 km) |
| Rancho Santa Margarita to Juana Díaz (Puerto Rico) | 3,318.19 mi (5,340.11 km) |
| Rancho Santa Margarita to Junction City (Kansas) | 1,210.39 mi (1,947.93 km) |
| Rancho Santa Margarita to Juneau (Alaska) | 1,878.53 mi (3,023.20 km) |
| Rancho Santa Margarita to Jupiter (Florida) | 2,271.53 mi (3,655.68 km) |
| Rancho Santa Margarita to Jupiter Farms (Florida) | 2,265.38 mi (3,645.77 km) |
| Rancho Santa Margarita to Jurupa Valley (California) | 26.55 mi (42.73 km) |
| Rancho Santa Margarita to Justice (Illinois) | 1,711.12 mi (2,753.79 km) |
| Rancho Santa Margarita to Kahului (Hawaii) | 2,526.88 mi (4,066.62 km) |
| Rancho Santa Margarita to Kailua (Hawaii) | 2,582.44 mi (4,156.03 km) |
| Rancho Santa Margarita to Kalamazoo (Michigan) | 1,830.66 mi (2,946.16 km) |
