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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Cameron, Alex | Rapid City, SD | — | Installer | — |
| Campbell, Gary | Custer, SD | — | Installer | — |
| Card Jr., Bert | Hot Springs, SD | — | Installer | — |
| Card, Rhonda | Hot Springs, SD | — | Installer | — |
| Cathey, Steven M | Deadwood, SD | — | Installer | — |
| Cheney, Benjamin | Belle Fourche, SD | — | Installer | — |
| Christianson, Thomas | Grand Prairie Township, SD | — | Installer | — |
| Clark, James | Colman, SD | — | Installer | — |
| Claymore, James L | Eureka, SD | — | Installer | — |
| Clift, Robert | Jefferson, SD | — | Installer | — |
| Cofoid, David | Keystone, SD | — | Installer | — |
| Coller, Sauntee C | Kadoka, SD | — | Installer | — |
| Collier, David | Rapid City, SD | — | Installer | — |
| Comes, Paul | Rapid City, SD | — | Installer | — |
| Conlon, Dennis | Sundance, SD | — | Installer | — |
| Conners, Christopher | Black Hawk, SD | — | Installer | — |
| Corr, Jack D | Hermosa, SD | — | Installer | — |
| Costopoulos, Levi M | Sturgis, SD | — | Installer | — |
| Counts, Anthony W | Sioux Falls, SD | — | Installer | — |
| Courtney, Brett | Hot Springs, SD | — | Installer | — |
| Cox, Kevin D | St. Joseph, SD | — | Installer | — |
| Craig, Drason | Whitewood, SD | — | Installer | — |
| Crawford, Shane P | Lead, SD | — | Installer | — |
| Creed, Scott M | Belle Fourche, SD | — | Installer | — |
| Crisman, Travis D | Custer, SD | — | Installer | — |
| Crittenden, Samuel | Rapid City, SD | — | Installer | — |
| Cvach, Casey | Belle Fourche, SD | — | Installer | — |
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