| Ronkonkoma to Castle Pines (Colorado) | 1,670.38 mi (2,688.22 km) |
| Ronkonkoma to Castle Rock (Colorado) | 1,670.89 mi (2,689.04 km) |
| Ronkonkoma to Castro Valley (California) | 2,592.89 mi (4,172.86 km) |
| Ronkonkoma to Catalina Foothills (Arizona) | 2,158.18 mi (3,473.26 km) |
| Ronkonkoma to Cataño (Puerto Rico) | 1,599.82 mi (2,574.67 km) |
| Ronkonkoma to Cathedral City (California) | 2,404.41 mi (3,869.53 km) |
| Ronkonkoma to Catonsville (Maryland) | 218.92 mi (352.32 km) |
| Ronkonkoma to Cave Spring (Virginia) | 444.35 mi (715.12 km) |
| Ronkonkoma to Cayce (South Carolina) | 642.50 mi (1,034.00 km) |
| Ronkonkoma to Cayey (Puerto Rico) | 1,621.21 mi (2,609.08 km) |
| Ronkonkoma to Cedar City (Utah) | 2,131.16 mi (3,429.77 km) |
| Ronkonkoma to Cedar Falls (Iowa) | 1,002.54 mi (1,613.43 km) |
| Ronkonkoma to Cedar Hill (Texas) | 1,431.58 mi (2,303.91 km) |
| Ronkonkoma to Cedar Lake (Indiana) | 745.62 mi (1,199.96 km) |
| Ronkonkoma to Cedar Mill (Oregon) | 2,484.23 mi (3,997.98 km) |
