| Casper’s Sandbar District | Field Trips | |
| Cassidy, Butch in Wyoming | Encyclopedia | Mac Blewer |
| Castle Gardens | Field Trips | |
| Cattle Kate, newspaper reporting of the lynching of | Encyclopedia | Tom Rea |
| CCC, Wyoming | Encyclopedia | Kerry Drake |
| Charles Hatch grave | Encyclopedia | Randy Brown |
| Chatterton, Fenimore | Encyclopedia | Wyoming State Archives |
| Cheney, Dick, biography of | Encyclopedia | Geoffrey O’Gara |
| Cheyenne Botanic Gardens | Field Trips | |
| Cheyenne Depot Museum | Field Trips | |
| Cheyenne Frontier Days Old West Museum | Field Trips | |
| Cheyenne's 100-Octane Airplane Fuel Plant | Encyclopedia | Mike Mackey |
| Cheyenne, Wyo., history of | Encyclopedia | Lori Van Pelt |
| Cheyennes tribes come together after Sand Creek | Encyclopedia | Tom Rea |
| Chinatown, Rock Springs | Field Trips | |
| Chinese Joss House Museum | Field Trips | |
| Chugwater Museum | Field Trips | |
| Church Butte | Field Trips | |
| Church Butte, Oregon Trail landmark | Encyclopedia | Randy Brown |
| Churches, African-American in Rock Springs | Encyclopedia | Brie Blasi |
| Civilian Conservation Corps, Wyoming | Encyclopedia | Kerry Drake |
| Clark, Alonzo | Encyclopedia | Wyoming State Archives |
| Clark, Clarence Don | Encyclopedia | Barbara Allen Bogart |
| Clary, William L., pioneer grave of | Encyclopedia | Randy Brown |
| Clay, John and the Swan Land and Cattle Company | Encyclopedia | Rebecca Hein |
| Clayton’s Slough | Field Trips | |
| Clayton’s Slough, Oregon Trail site of | Encyclopedia | WyoHistory.org |
| Coal Camps in Sheridan County | Encyclopedia | Kevin Knapp |
| Coal mine safety, history of | Encyclopedia | Phil Roberts |
| Coal Slurry Pipeline, History of | Encyclopedia | Dan Whipple |
| Coal tipple, Reliance | Encyclopedia | Dick Blust, Jr. |
| Coal, Wyoming business of | Encyclopedia | Chamois L. Andersen |
| Coal-bed Methane boom, Powder River Basin | Encyclopedia | Dustin Bleizeffer |
| Cody Mural Visitor Center | Field Trips | |
| Cody Stampede | Field Trips | |
| Cody, William F. and the Pony Express | Encyclopedia | Tom Rea |
| Cody, William F. as Wyoming Town Founder and Irrigation Tycoon | Encyclopedia | Robert E. Bonner |
| Cody, William F., hunts with Prince Albert of Monaco, 1913 | Encyclopedia | John Clayton |
| Cody, Wyoming | Encyclopedia | Lynn Johnson Houze |
| Coe Library, University of Wyoming | Field Trips | |
| Cokeville Elementary School | Field Trips | |
| Cokeville Elementary School Bombing | Encyclopedia | Jessica Clark |
| Cokeville survivor oral history, Carol Petersen | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, Glenna Walker | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, Jamie Buckley King | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, Janel Dayton | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, Kathy Davison | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, Kevin Walker | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, Kliss Sparks | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, LeaKae Roberts Weston | Oral Histories | Wyoming State Archives |
