| Rancho Santa Margarita to Carlsbad (California) | 39.49 mi (63.55 km) |
| Rancho Santa Margarita to Carlsbad (New Mexico) | 778.13 mi (1,252.27 km) |
| Rancho Santa Margarita to Carmel (Indiana) | 1,784.28 mi (2,871.52 km) |
| Rancho Santa Margarita to Carmichael (California) | 403.16 mi (648.82 km) |
| Rancho Santa Margarita to Carney (Maryland) | 2,295.32 mi (3,693.97 km) |
| Rancho Santa Margarita to Carnot-Moon (Pennsylvania) | 2,098.29 mi (3,376.88 km) |
| Rancho Santa Margarita to Carol Stream (Illinois) | 1,698.05 mi (2,732.75 km) |
| Rancho Santa Margarita to Carolina (Puerto Rico) | 3,336.40 mi (5,369.42 km) |
| Rancho Santa Margarita to Carolina Forest (South Carolina) | 2,210.41 mi (3,557.32 km) |
| Rancho Santa Margarita to Carpentersville (Illinois) | 1,692.55 mi (2,723.89 km) |
| Rancho Santa Margarita to Carpinteria (California) | 121.62 mi (195.73 km) |
| Rancho Santa Margarita to Carrboro (North Carolina) | 2,177.16 mi (3,503.79 km) |
| Rancho Santa Margarita to Carroll (Iowa) | 1,364.83 mi (2,196.49 km) |
| Rancho Santa Margarita to Carrollton (Georgia) | 1,863.21 mi (2,998.55 km) |
| Rancho Santa Margarita to Carrollton (Texas) | 1,194.03 mi (1,921.60 km) |
