Montana - Criteria: A (event)
| Acme Building |
| Adair, W. L., General Mercantile Historic District |
| Adams Block |
| Adams Hotel |
| Adam's, J. C., Stone Barn |
| Administration Building |
| Airway Radio Station |
| Alberton School |
| Algeria Shrine Temple |
| Alice Creek Historic District |
| Allison-Reinkeh House |
| Alpine Apartments |
| Anaconda Commercial Historic District |
| Anaconda Copper Mining Company Smoke Stack |
| Anaconda Saddle Club |
| Ancient Order of Hibernians Hall |
| Anderson, Herman and Hannah, House |
| Anderson Lumber Company |
| Anderson School |
| Andrus Hotel |
| Ant Flat Ranger Station |
| Apartment Building at 116 Spruce Street |
| Apgar Fire Lookout |
| Appleton House No. 13 |
| Armitage, Joshua and Martha, House |
| Armour Cold Storage |
| Arvon Block |
| Atlantic Hotel |
| Atlas Block |
| Babb-Piegan, Montana, Inspection Station |
| Babcock Theatre Building |
| Bad Pass Trail |
| Bad Route Creek Bridge |
| Baker and Lovering Store |
| Baker Hotel |
| Baldwin Building |
| Baldwin House |
| Bannack Historic District |
| Barich Block |
| Barnett, R. T., and Company Building |
| Bartlett, Jack, House |
| Bearcreek Bank |
| Beaverhead Rock-Lewis and Clark Expedition |
| Beck, Alice, Cabin |
| Belgrade City Hall and Jail |
| Bell Street Bridge |
| Belly River Ranger Station Historic District |
| Belmont Hotel |
| Belt Commercial Historic District |
| Belt Jail |
| Belton Chalets |
| Benson, Dr. Theodore J., House |
| Benton Avenue Cemetery |
| Bestwick's Market |
| Bethany Lutheran Church |
| Big Arm School |
| Big Creek Ranger Station Historic District |
| Big Hole National Battlefield |
| Bighorn Ditch Headgate |
| Big Horn River Bridge |
| Big Timber Town Hall |
| Bitter Root Cooperative Creamery |
| Blackmore Apartments |
| Blewett, John, House |
| Bluebird Building |
| Blue Front Rooming House |
| Bluewater Creek Bridge |
| Bones Brothers Ranch |
| Bon Ton Historic District |
| Bookman, J. A., General Store |
| Boothill Cemetery |
| Boulder Hot Springs Hotel |
| Boulder Point Lookout |
| Bowman Lake Patrol Cabin |
| Bowman Lake Road |
| Boyd's Shop |
| Bozeman Armory |
| Bozeman Brewery Historic District |
| Bozeman Carnegie Library |
| Bozeman National Fish Hatchery |
| Bozeman YMCA |
| Branscombe Automobile Machine Shop |
| Brice Apartments |
| Bridger Arms Apartments |
| Broadwater, Charles A., House |
| Brooder, Frank, House |
| Brooks Hotel |
| Brotherhood of Locomotive Engineers Hall |
| Browne's Bridge |
| Brunswick Hotel |
| Bruyer Granary |
| B Street District |
| Bull River Guard Station |
| Burgess Garage |
| Butte, Anaconda and Pacific Railway Historic District |
| Butte-Anaconda Historic District |
| Byam, Dr. Don L., House |
| Camas Creek Cutoff Road |
| Cammock's Hotel |
| Camp Disappointment |
Data from United States Park Service and Wikidata
