| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Bacon | city | Idaho | United States | 44.64 | -116.55 | 2919 | |
| Baker | city | Idaho | United States | 45.09 | -113.73 | 4547 | |
| Bancroft | city | Idaho | United States | 42.72 | -111.89 | 5446 | |
| Banida | city | Idaho | United States | 42.23 | -111.94 | 5029 | |
| Banks | city | Idaho | United States | 44.08 | -116.12 | 2798 | |
| Banner | city | Idaho | United States | 44.02 | -115.54 | 6200 | |
| Bannock | city | Idaho | United States | 42.86 | -112.72 | 4452 | |
| Barber | city | Idaho | United States | 43.57 | -116.11 | 3349 | |
| Barite | city | Idaho | United States | 43.56 | -114.33 | 5869 | |
| Barlow | city | Idaho | United States | 43.67 | -112.01 | 5029 | |
| Barrymore | city | Idaho | United States | 42.68 | -114.46 | 4189 | |
| Barton | city | Idaho | United States | 44.38 | -116.80 | 3349 | |
| Basalt | city | Idaho | United States | 43.32 | -112.16 | 4599 | |
| Basin | city | Idaho | United States | 42.25 | -113.78 | 5101 | |
| Bassett | city | Idaho | United States | 43.65 | -112.09 | 5029 | |
| Bates | city | Idaho | United States | 43.69 | -111.20 | 6076 | |
| Bayhorse | city | Idaho | United States | 44.40 | -114.31 | 6000 | |
| Bayview | city | Idaho | United States | 47.98 | -116.56 | 2060 | |
| Beachs Corner | city | Idaho | United States | 43.54 | -111.96 | 5029 | |
| Bear | city | Idaho | United States | 45.02 | -116.67 | 4399 | |
| Bear Creek Summer Home Area | city | Idaho | United States | 44.17 | -115.19 | 5869 | |
| Bear Lake Hot Springs | city | Idaho | United States | 42.11 | -111.27 | 5921 | |
| Bear Lake Sands | city | Idaho | United States | 42.05 | -111.25 | 6197 | |
| Beatty | city | Idaho | United States | 43.61 | -116.34 | 2677 | |
| Bedstead Corner | city | Idaho | United States | 44.28 | -111.79 | 6709 | |
| Beeman | city | Idaho | United States | 46.41 | -116.53 | 3366 | |
| Beer Bottle Crossing | city | Idaho | United States | 44.61 | -116.23 | 6095 | |
| Beetville | city | Idaho | United States | 42.49 | -113.83 | 4212 | |
| Bellevue | city | Idaho | United States | 43.46 | -114.26 | 5196 | |
| Bellgrove | city | Idaho | United States | 47.53 | -116.91 | 2582 | |
| Belmont | city | Idaho | United States | 47.93 | -116.64 | 2509 | |
| Belvidere | city | Idaho | United States | 44.48 | -116.03 | 5029 | |
| Bench | city | Idaho | United States | 42.50 | -111.68 | 5442 | |
| Benewah | city | Idaho | United States | 47.23 | -116.78 | 2811 | |
| Bengoechea Place | city | Idaho | United States | 42.30 | -115.85 | 5029 | |
| Bennington | city | Idaho | United States | 42.39 | -111.32 | 6026 | |
| Berenice | city | Idaho | United States | 43.83 | -112.97 | 5029 | |
| Berger | city | Idaho | United States | 42.47 | -114.57 | 4248 | |
| Bergstrom Place | city | Idaho | United States | 42.19 | -114.94 | 5429 | |
| Bern | city | Idaho | United States | 42.34 | -111.39 | 5951 | |
| Besslen | city | Idaho | United States | 42.91 | -114.17 | 4189 | |
| Best Corner | city | Idaho | United States | 46.56 | -116.15 | 3349 | |
| Bickel (historical) | city | Idaho | United States | 42.53 | -114.21 | 4189 | |
| Big Cedar | city | Idaho | United States | 46.08 | -115.81 | 2667 | |
| Big Creek | city | Idaho | United States | 45.13 | -115.32 | 5869 | |
| Big Eddy | city | Idaho | United States | 44.22 | -116.11 | 4478 | |
| Big George | city | Idaho | United States | 46.50 | -116.49 | 1204 | |
| Big Springs | city | Idaho | United States | 44.50 | -111.26 | 6709 | |
| Bills | city | Idaho | United States | 42.53 | -114.29 | 4189 | |
| Bingo Creek Landing | city | Idaho | United States | 46.76 | -115.74 | 3349 | |
| Black Bear | city | Idaho | United States | 47.52 | -115.85 | 4189 | |
| Black Canyon | city | Idaho | United States | 43.93 | -116.44 | 2509 | |
| Black Pine | city | Idaho | United States | 42.07 | -112.98 | 5029 | |
| Blackbird | city | Idaho | United States | 45.11 | -114.22 | 5869 | |
| Blackcloud | city | Idaho | United States | 47.50 | -115.90 | 3349 | |
| Blackfoot | city | Idaho | United States | 43.19 | -112.34 | 4501 | |
| Blackrock | city | Idaho | United States | 42.80 | -112.33 | 4599 | |
| Blacks (historical) | city | Idaho | United States | 43.46 | -116.01 | 3599 | |
| Blacks Creek | city | Idaho | United States | 43.48 | -116.14 | 3349 | |
| Blacktail | city | Idaho | United States | 48.12 | -116.49 | 2060 | |
| Blackwell | city | Idaho | United States | 47.70 | -116.81 | 2509 | |
| Blaine | city | Idaho | United States | 46.66 | -116.95 | 2874 | |
| Blaine | city | Idaho | United States | 43.34 | -114.60 | 5029 | |
| Blake | city | Idaho | United States | 46.47 | -116.18 | 1669 | |
| Blanchard | city | Idaho | United States | 48.02 | -116.98 | 2509 | |
| Bliss | city | Idaho | United States | 42.93 | -114.95 | 3349 | |
| Bloomington | city | Idaho | United States | 42.19 | -111.40 | 5961 | |
| Blue Dome | city | Idaho | United States | 44.16 | -112.91 | 6125 | |
| Boehls | city | Idaho | United States | 46.87 | -115.91 | 1669 | |
| Bogle | city | Idaho | United States | 47.35 | -115.74 | 3349 | |
| Boise | city | Idaho | United States | 43.61 | -116.20 | 2739 | |
| Boise Hills Village | city | Idaho | United States | 43.63 | -116.19 | 2903 | |
| Boise Junction | city | Idaho | United States | 43.60 | -116.26 | 2742 | |
| Boisisitija | city | Idaho | United States | 43.61 | -116.20 | 2739 | |
| Boizis | city | Idaho | United States | 43.61 | -116.20 | 2739 | |
| Boles | city | Idaho | United States | 45.91 | -116.50 | 4599 | |
| Bonanza | city | Idaho | United States | 44.37 | -114.73 | 6709 | |
| Bone | city | Idaho | United States | 43.31 | -111.80 | 6128 | |
| Bonners Ferry | city | Idaho | United States | 48.69 | -116.32 | 2037 | |
| Borax (historical) | city | Idaho | United States | 47.43 | -115.67 | 5029 | |
| Border | city | Idaho | United States | 42.18 | -111.05 | 6184 | |
| Boulder | city | Idaho | United States | 43.84 | -114.51 | 9504 | |
| Boulder City (historical) | city | Idaho | United States | 48.60 | -116.07 | 3349 | |
| Bovard (historical) | city | Idaho | United States | 46.67 | -116.70 | 1998 | |
| Bovill | city | Idaho | United States | 46.86 | -116.39 | 2910 | |
| Bowmont | city | Idaho | United States | 43.46 | -116.54 | 2726 | |
| Box Canyon | city | Idaho | United States | 44.38 | -111.41 | 6190 | |
| Boyer | city | Idaho | United States | 48.32 | -116.44 | 2509 | |
| Bradley | city | Idaho | United States | 47.55 | -116.16 | 2509 | |
| Bramwell | city | Idaho | United States | 43.84 | -116.58 | 2509 | |
| Bridge | city | Idaho | United States | 42.13 | -113.34 | 5029 | |
| Broadford | city | Idaho | United States | 43.47 | -114.28 | 5203 | |
| Bronx | city | Idaho | United States | 48.35 | -116.55 | 2509 | |
| Broten | city | Idaho | United States | 48.22 | -116.42 | 2509 | |
| Brownlee | city | Idaho | United States | 44.01 | -116.25 | 4189 | |
| Bruce Eddy | city | Idaho | United States | 46.51 | -116.29 | 1669 | |
| Bruneau | city | Idaho | United States | 42.88 | -115.80 | 2598 | |
| Brunning | city | Idaho | United States | 46.48 | -116.14 | 2831 | |
| Buckingham | city | Idaho | United States | 43.99 | -116.89 | 2509 | |
| Budge | city | Idaho | United States | 42.61 | -113.82 | 4189 | |
| Bugtown (historical) | city | Idaho | United States | 43.66 | -116.67 | 2509 | |
| Buhl | city | Idaho | United States | 42.60 | -114.76 | 4189 | |
| Buist | city | Idaho | United States | 42.33 | -112.61 | 5157 | |
| Bullion | city | Idaho | United States | 43.47 | -114.38 | 5869 | |
| Bullion (historical) | city | Idaho | United States | 47.43 | -115.67 | 5029 | |
| Buncel Place | city | Idaho | United States | 42.55 | -116.02 | 5029 | |
| Bundy | city | Idaho | United States | 46.36 | -116.76 | 1669 | |
| Bunn | city | Idaho | United States | 47.51 | -115.90 | 3428 | |
| Burgdorf | city | Idaho | United States | 45.28 | -115.91 | 6197 | |
| Burke | city | Idaho | United States | 47.52 | -115.82 | 5124 | |
| Burley | city | Idaho | United States | 42.54 | -113.79 | 4189 | |
| Burmah | city | Idaho | United States | 43.13 | -114.26 | 4563 | |
| Burns | city | Idaho | United States | 48.63 | -116.39 | 2001 | |
| Burton | city | Idaho | United States | 43.80 | -111.86 | 5029 | |
| Buswell (historical) | city | Idaho | United States | 46.83 | -117.03 | 2687 | |
| Butte City | city | Idaho | United States | 43.61 | -113.24 | 5360 | |
| Byrne | city | Idaho | United States | 43.69 | -111.75 | 5029 |