| Grayslake to Castle Pines (Colorado) | 899.85 mi (1,448.18 km) |
| Grayslake to Castle Rock (Colorado) | 900.87 mi (1,449.80 km) |
| Grayslake to Castro Valley (California) | 1,816.17 mi (2,922.84 km) |
| Grayslake to Catalina Foothills (Arizona) | 1,427.68 mi (2,297.63 km) |
| Grayslake to Cataño (Puerto Rico) | 2,091.32 mi (3,365.65 km) |
| Grayslake to Cathedral City (California) | 1,644.44 mi (2,646.47 km) |
| Grayslake to Catonsville (Maryland) | 627.03 mi (1,009.11 km) |
| Grayslake to Cave Spring (Virginia) | 553.21 mi (890.31 km) |
| Grayslake to Cayce (South Carolina) | 692.76 mi (1,114.89 km) |
| Grayslake to Cayey (Puerto Rico) | 2,109.33 mi (3,394.64 km) |
| Grayslake to Cedar City (Utah) | 1,359.33 mi (2,187.63 km) |
| Grayslake to Cedar Falls (Iowa) | 225.71 mi (363.25 km) |
| Grayslake to Cedar Hill (Texas) | 832.18 mi (1,339.27 km) |
| Grayslake to Cedar Lake (Indiana) | 73.74 mi (118.67 km) |
| Grayslake to Cedar Mill (Oregon) | 1,730.06 mi (2,784.27 km) |
