| 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 miners, Black | Encyclopedia | Brigida R. (Brie) Blasi |
| 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 Heritage Museum | Field Trips | |
| 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 |
| Cokeville survivor oral history, Rachel Walker Hollibaugh | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, Rich Haskell | Oral Histories | Jessica Clark |
| Cokeville survivor oral history, Ron Hartley | Oral Histories | Wyoming State Archives |
| Cokeville survivor oral history, Tina Cook | Oral Histories | Wyoming State Archives |
| Colby Mammoth Site | Encyclopedia | WyomingHeritage.org |
| Colby Mammoth Site | Field Trips | |
| Cole Creek train wreck | Encyclopedia | Lori Van Pelt |
| Como Bluff | Encyclopedia | Stephanie Lowe |
| Como Bluff | Field Trips | |
| Connor Battlefield | Field Trips | |
| Connor Battlefield | Encyclopedia | WyomingHeritage.org |
| Connor, Patrick E. | Encyclopedia | Ellis Hein |
| Converse County, Wyoming | Encyclopedia | Doug McInnis |
| Cook, Tina, Cokeville survivor oral history | Oral Histories | Wyoming State Archives |
| Coolidge, Sherman | Encyclopedia | Tadeusz Lewandowski |
| Cooper House | Field Trips | |
| Corum, Alfred, pioneer grave of | Encyclopedia | Randy Brown |
| Costin, James O., bank robber | Encyclopedia | Brigida R. (Brie) Blasi |
| Cottonwood Creek Dinosaur Trail | Field Trips | |
| Cowley Pioneer Museum | Field Trips | |
| Coxey’s Army in Wyoming | Encyclopedia | Brigida R. (Brie) Blasi |
| Craig Thomas Discovery and Visitor Center | Field Trips | |
| Crane, Arthur | Encyclopedia | Wyoming State Archives |
