| Carbon County Museum | Field Trips | |
| Carbon County, Wyoming | Encyclopedia | Lori Van Pelt |
| Carbon, Wyoming | Encyclopedia | WyoHistory.org |
| Carbon, Wyoming | Field Trips | |
| Carey, Joseph | Encyclopedia | Wyoming State Archives |
| Carey, Robert | Encyclopedia | Wyoming State Archives |
| Carlisle, Bill | Encyclopedia | Lori Van Pelt |
| Carriage House Theatre | Field Trips | |
| Carson, Kit, in Wyoming and the West | Encyclopedia | Tom Rea |
| Casper Army Air Base Murals | Encyclopedia | Eric Wimmer |
| Casper Army Air Base, history of | Encyclopedia | John Goss |
| Casper College Western History Center | Field Trips | |
| Casper Odd Fellows Building | Field Trips | |
| Casper Star-Tribune, Northern Utilities and | Encyclopedia | Kerry Drake |
| Casper, Wyoming | Encyclopedia | Rebecca A. Hunt |
| 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, Northern, return from Oklahoma | Encyclopedia | Gerry Robinson |
| 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 Bust, Wyoming’s First | Encyclopedia | Dustin Bleizeffer |
| 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 |
