| San Marcos to Ramsey (New Jersey) | 2,408.21 mi (3,875.63 km) |
| San Marcos to Rancho Cordova (California) | 439.62 mi (707.50 km) |
| San Marcos to Rancho Cucamonga (California) | 72.01 mi (115.89 km) |
| San Marcos to Rancho Mirage (California) | 61.17 mi (98.44 km) |
| San Marcos to Rancho Palos Verdes (California) | 80.85 mi (130.12 km) |
| San Marcos to Rancho San Diego (California) | 29.68 mi (47.76 km) |
| San Marcos to Rancho Santa Margarita (California) | 42.17 mi (67.86 km) |
| San Marcos to Randallstown (Maryland) | 2,270.97 mi (3,654.77 km) |
| San Marcos to Rantoul (Illinois) | 1,673.13 mi (2,692.64 km) |
| San Marcos to Rapid City (South Dakota) | 1,064.22 mi (1,712.69 km) |
| San Marcos to Ravenna (Ohio) | 2,039.18 mi (3,281.74 km) |
| San Marcos to Raymondville (Texas) | 1,248.15 mi (2,008.71 km) |
| San Marcos to Raymore (Missouri) | 1,325.21 mi (2,132.73 km) |
| San Marcos to Raytown (Missouri) | 1,327.31 mi (2,136.10 km) |
| San Marcos to Reading (Ohio) | 1,863.01 mi (2,998.22 km) |
