Montana - Criteria: C (architecture/engineering)
| Brooder, Frank, House |
| Brooks Hotel |
| Brotherhood of Locomotive Engineers Hall |
| Browne's Bridge |
| Brunswick Hotel |
| Bruyer Granary |
| B Street District |
| Buck, Charles Amos, House |
| Buck, Fred, House |
| Bull River Guard Station |
| Burke, Thomas H., House |
| Busch House |
| Butte, Anaconda and Pacific Railway Historic District |
| Byam, Dr. Don L., House |
| Calvary Episcopal Church |
| Camas Creek Cutoff Road |
| Cammock's Hotel |
| Camp Paxson Boy Scout Camp (24MO77) |
| Camp Senia Historic District |
| Caple, W. T., House |
| Carbella Bridge |
| Carlton Community Church |
| Carnegie Public Library |
| Carnegie Public Library |
| Carnegie Public Library |
| Carriage House Historic District |
| Carter Bridge |
| Cascade County Courthouse |
| Cathedral of Saint Helena |
| Cattle Queen Snowshoe Cabin |
| Chadwick House |
| Chicago, Milwaukee and St. Paul Passenger Depot |
| Chief Mountain Border Station and Quarters |
| Childs Carriage House |
| Child, W. C., Ranch |
| Chouteau County Courthouse |
| Christ Episcopal Church and Rectory |
| Christie, Thomas J., House |
| City Hall |
| City Water Department |
| Clack, H. Earl, House |
| Clack, H. Earl, Service Station |
| Clark-Cardwell House |
| Clark, Charles W., Mansion |
| Clark, Jennie, House |
| Clark, W. A., Mansion |
| Club Moderne |
| Coal Creek Patrol Cabin |
| Cochran, William, House |
| Colburn House |
| Cold Springs Ranch House |
| Coleman, William E., House |
| Collins, James V., House |
| Collins, Timothy Edwards, Mansion |
| Commercial District |
| Commercial District |
| Conley Street Bridge |
| Conrad, C.E., Memorial Cemetery |
| Conrad, Charles E., Mansion |
| Conrad City Hall |
| Continental Oil Company Filling Station |
| Conway House |
| Cook, Calvin and Maggie, House |
| Cooke City Store |
| Cook Farm |
| Cook, Wilbur, House |
| Cooper Park Historic District |
| Corey House |
| Cottonwood Creek Bridge |
| Cottonwood School |
| Cougar Peak Lookout |
| Courthouse Historic District |
| Crail Ranch Buildings |
| Cramer, Martin, House |
| Cross Ranch Headquarters |
| Crow Creek Water Ditch |
| Crum, William C., House |
| Cut Bank Ranger Station Historic District |
| Cuthbert, D. H., House |
| Daly, Marcus, Memorial Hospital |
| Daniels County Courthouse |
| Dave's Texaco |
| Davidson Building |
| Dayton State Bank |
| Dean, A. J., House |
| Dearborn River High Bridge |
| Deer Lodge American Women's League Chapter House |
| Deer Lodge Central Business Historic District |
| Deer Lodge County Courthouse |
| DeNayer House |
| DESMET (boat) |
| DeSmet Schoolhouse |
| Dillon City Library |
| Dixon-Duncan Block |
| Doe, M. E., House |
| Dokken-Nelson Funeral Home |
| Doncaster Round Barn |
| Double Arrow Lookout |
| Draft Horse Barn, Fergus County Fairgrounds |
| Drinkenberg's, F. H., First Home |
Data from United States Park Service and Wikidata
