| Columbia & Nehalem River Railroad No. 123, Kerry, OR |
1289 |
| Columbia & Nehalem Valley Railroad No. 1, Columbia City, OR |
239 |
| Columbia & Nehalem Valley Railroad No. 2, Columbia City, OR |
477 |
| Columbia Valley Logging Co., Cultus Lake, OR |
X553 |
| Columbia-Panama Coal Co., Manchester, KY |
814 |
| Commonwealth Lumber Co. No. 1, Alderson, WV |
X107 |
| Conasauga River Lumber Co., Conasauga, TN |
934 |
| Conasauga River Lumber Co., Conasauga, TN |
1531 |
| Condon Lane Boom & Lumber Co. No. 4, Horton, WV |
X91 |
| Connecticut Electric Railway Association, Warehouse Point, CT |
1059 |
| Connell, J. D. - Iron Works, New Orleans, LA |
171 |
| Conrad, J. Penn, Philadelphia, PA |
X267 |
| Consolidated Lumber Co. No. 1, PA |
X164 |
| Continental Timber Co. No. 1, Luxton Siding, BC |
160 |
| Conway Co. No. 5 (1st), Conway, NH |
X108 |
| Cook & Duncan Lumber Co. No. 1, Fort Hill, PA |
798 |
| Cook & Duncan Lumber Co. No. 3, Fort Hill, PA |
1271 |
| Cook & Parsons, Bidwell, PA |
X290 |
| Cook & Sechler, West Salisbury, PA |
X538 |
| Cooper, T. J., Chalker, GA |
X370 |
| Coos Bay Lumber Co. No. 5, Powers, OR |
445 |
| Copalis Lumber Co. No. 2, Carlisle, WA |
200 |
| Corbin Coal & Coke Co. Ltd. No. 6, Corbin, BC |
1622 |
| Corry Historical Society Museum, Corry, PA |
1681 |
| CORRY R.A.I.L.S - Corry Rail & Industrial Legacy Society & Museum, Corry, PA |
313 |
| Corvallis Logging Co., Monroe, OR |
504 |
| Corvallis Logging Co., Monroe, OR |
1333 |
| Corvallis Lumber & Manufacturing Co., Corvallis, OR |
504 |
| Cotton States Lumber Co., Meehan Junction, MS |
X97 |
| Cotton States Lumber Co., Meehan Junction, MS |
X98 |
| Cotton States Lumber Co., Meehan Junction, MS |
X99 |
| Cottrel, Joseph W. - Lumber Co., Lipscomb, VA |
X409 |
| Courtney, D. G., Dundon, WV |
X325 |
| Courtney, D. G., Poca, WV |
X249 |
| Courtney, D. G., Red House Shoals, WV |
X15 |
| Covington Creek Lumber Co., Kent, WA |
504 |
| Cowichan Lake Lumber Co. No. 1, Cowichan Lake, BC |
1657 |
| Cowichan Lake Lumber Co. No. 44, Cowichan Lake, BC |
1525 |
| Cradle of Forestry in America, Pisgah Forest, NC |
1323 |
| Craggy Lumber Co. No. 1 A. M. KISTLER, Bee Tree, NC |
X560 |
| Craggy Lumber Co. No. 4, Bee Tree, NC |
1157 |
| Craig Mountain Lumber Co. No. 5, Winchester, ID |
1671 |
| Craig-Taylor Lumber Co. No. 1, Otter, BC |
209 |
| Cranwell, J. H., Pikesville, TN |
X522 |
| Crawford Coal & Coke Co. No. 4, Highhouse, PA |
X436 |
| Creech Brothers Lumber Co. No. 1, Wheaton Spur, WA |
936 |
| Crescent Lumber Co. No. 1, Cressmont, WV |
814 |
| Croft Lumber Co. No. 7, Alexander, WV |
1439 |
| Croft Lumber Co. No. 8, Suncrest, WV |
X180 |
| Croft Lumber Co. No. 9, Suncrest, WV |
X181 |
