Organizations by School Grades
| Name | Grades | City | Phone number | |
|---|---|---|---|---|
| Clark County Jr./Sr. High School | Senior high | Dubois | (208) 374-5215 | |
| Clark Fork Jr./Sr. High School | Senior high | Clark Fork | (208) 266-1131 | |
| Clarkia District Library | Clarkia | (208) 245-2908 | ||
| Classical Christian Academy |
Elementary Middle/Junior high Senior high |
Post Falls | (208) 777-4400 | |
| Claude A. Wilcox Elem School | Elementary | Pocatello | (208) 237-6050 | |
| Clayton Elementary School | Elementary | Clayton | (208) 838-2244 | |
| Clearwater County District Library | Weippe | (208) 435-4058 | ||
| Clearwater Memorial Library | Orofino | (208) 476-3411 | ||
| Clearwater Valley Elementary School | Elementary | Kooskia | (208) 926-4311 | |
| Clearwater Valley Jr./Sr. High School | Senior high | Kooskia | (208) 926-4511 | |
| Clover Creek High School (Alt.) | Senior high | Montpelier | (208) 847-2516 | |
| Clover Trinity Lutheran School |
Elementary Middle/Junior high |
Buhl | (208) 326-5198 | |
| Cloverdale Elementary School | Elementary | Idaho Falls | (208) 525-4450 | |
| Coeur d'Alene Charter Academy |
Middle/Junior high Senior high |
Coeur d'Alene | (208) 676-1667 | |
| Coeur d'Alene Christian School |
Elementary Middle/Junior high |
Dalton Gardens | (208) 772-7118 | |
| Coeur d'Alene High School | Senior high | Coeur d'Alene | (208) 667-4507 | |
| Coeur d'Alene Public Library | Coeur d'Alene | (208) 769-2315 | ||
| Coeur d'Alene Tribal School |
Elementary Middle/Junior high |
DeSmet | (208) 686-5808 | |
| Cole Valley Christian Elementary School | Elementary | Boise | (208) 375-3571 | |
| Cole Valley Christian Secondary School |
Middle/Junior high Senior high |
Meridian | (208) 898-9003 | |
| College of Southern Idaho Library | Twin Falls | 732-6500 | ||
| College of Western Idaho | Nampa | (208) 562-3000 | ||
| Collister Elementary School | Elementary | Boise | (208) 338-3436 | |
| Colorado State Library | Denver | (303)866-6900 | ||
| Columbia High School | Senior high | Nampa | (208) 498-0571 | |
| Community Library Association | Ketchum | (208) 726-3493 | ||
| Community School |
Elementary Middle/Junior high Senior high |
Sun Valley | (208) 622-3955 | |
| Compass Charter School |
Elementary Middle/Junior high Senior high |
Meridian | (208) 855-2802 | |
| Connecticut State Library | Hartford | (860)757-6506 | ||
| Cornerstone Christian School |
Elementary Middle/Junior high |
Lewiston | (208) 798-7149 |