Montana - Criteria: A (event)
| Camp Four |
| Camp Paxson Boy Scout Camp (24MO77) |
| Camp Senia Historic District |
| Carbella Bridge |
| Carlton Community Church |
| Carnegie Public Library |
| Carnegie Public Library |
| Carnegie Public Library |
| Carriage House Historic District |
| Carter Bridge |
| Cat Creek Oil Field Sign |
| Cattle Queen Snowshoe Cabin |
| Cheever-Cain Ranch |
| Chicago, Milwaukee and St. Paul Passenger Depot |
| Chief Joseph Battleground of the Bear's Paw |
| Chief Mountain Border Station and Quarters |
| Chief Plenty Coups (Alek-Chea-Ahoosh) House |
| Chivers Memorial Church |
| Chouteau County Courthouse |
| City Water Department |
| Clack, H. Earl, Service Station |
| Coal Creek Patrol Cabin |
| Cold Springs Ranch House |
| Comertown Historic District |
| Commercial District |
| Commercial District |
| Conley Street Bridge |
| Conrad, C.E., Memorial Cemetery |
| Conrad City Hall |
| Continental Oil Company Filling Station |
| Cooke City Store |
| Cook Farm |
| Cooper Park Historic District |
| Coram Hotel, The |
| Cottonwood Creek Bridge |
| Cottonwood School |
| Cougar Peak Lookout |
| Courthouse Historic District |
| Crail Ranch Buildings |
| Cross Ranch Headquarters |
| Crow Creek Water Ditch |
| Crump-Howard House |
| Crum, William C., House |
| Cut Bank Ranger Station Historic District |
| Cuthbert, D. H., House |
| Daly, Marcus, Memorial Hospital |
| Daniels County Courthouse |
| Daniels, Mansfield A., House |
| Dave's Texaco |
| Davidson Building |
| Dayton State Bank |
| Dearborn River High Bridge |
| DeBorgia Schoolhouse |
| Deer Lodge American Women's League Chapter House |
| Deer Lodge Central Business Historic District |
| DESMET (boat) |
| DeSmet Schoolhouse |
| Detention Hospital |
| Dillon City Library |
| Dixon-Duncan Block |
| Doncaster Round Barn |
| Donovan-Mayer House |
| Dorsey Grocery and Residence |
| Double Arrow Lodge |
| Double Arrow Lookout |
| Draft Horse Barn, Fergus County Fairgrounds |
| Dry Creek School |
| Dude Rancher Lodge |
| Eagle Butte School |
| Eagle Guard Station |
| East Glacier Ranger Station Historic District |
| East Main Street Residential Historic District |
| El Capitan Lodge |
| Electric Building |
| Emerson School |
| Employee's Hotel and Garage |
| Erb, Abraham and Carrie, House |
| Ervin Homestead-Gist Bottom Historic District |
| Etna School |
| Eureka Community Hall |
| Evaro School |
| Ewing-Snell Ranch |
| Fallon County Jail |
| Farmers and Merchants State Bank |
| Federal Building |
| Federal Building and US Post Office-Bozeman |
| Fergus County Improvement Corporation Dormitory |
| Ferris-Hermsmeyer-Fenton |
| Fielding Snowshoe Patrol Cabin |
| Fire Hall |
| Fire House No. 2 |
| First Baptist Church |
| First National Bank of Ekalaka and Rickard Hardware Store Building |
| First National Bank of Geraldine |
| First National Bank of Glasgow |
| First Presbyterian Church |
| First Presbyterian Church of Whitefish |
| First State Bank, Dowling and Emhoff Buildings |
| First State Bank of Chester |
| First United Methodist Church Parsonage |
Data from United States Park Service and Wikidata
