Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Mickey Creek | Stream | | Adams | 45 06 31 N | 116 33 49 W |
| Micky Point | Summit | 1597 | Clearwater | 46 48 07 N | 115 44 18 W |
| Micro Creek | Stream | | Bonner | 48 05 29 N | 116 35 30 W |
| Microwave Siphon Station | Locale | 1007 | Adams | 44 38 24 N | 116 26 59 W |
| Mid Cottonwood Point | Locale | 2664 | Custer | 44 37 24 N | 114 41 04 W |
| Midas (historical) | Locale | 652 | Bonner | 48 11 03 N | 116 25 46 W |
| Midasville | Populated Place | 1752 | Idaho | 45 33 37 N | 115 28 12 W |
| Middle Bench Reservoir | Reservoir | 1771 | Owyhee | 42 30 10 N | 116 24 57 W |
| Middle Branch Fall River Canal | Canal | 1521 | Fremont | 43 57 16 N | 111 38 16 W |
| Middle Brownlee Creek | Stream | | Washington | 44 45 26 N | 116 53 59 W |
| Middle Butte | Summit | 1592 | Bingham | 43 29 55 N | 112 44 44 W |
| Middle Butte | Summit | 1641 | Idaho | 46 18 03 N | 115 28 14 W |
| Middle Butte | Summit | 1703 | Owyhee | 42 10 56 N | 115 22 13 W |
| Middle Canyon | Valley | | Butte | 43 52 42 N | 112 57 56 W |
| Middle Canyon | Valley | | Custer | 44 02 44 N | 114 17 27 W |
| Middle Canyon | Valley | | Twin Falls | 42 04 37 N | 114 49 07 W |
| Middle Cramer Lake | Lake | 2547 | Custer | 44 01 52 N | 114 59 26 W |
| Middle Creek | Stream | | Bingham | 43 08 10 N | 111 39 27 W |
| Middle Creek | Stream | | Clark | 44 16 32 N | 112 26 11 W |
| Middle Creek | Stream | | Clearwater | 46 31 15 N | 115 24 45 W |
| Middle Creek | Stream | | Lemhi | 44 24 53 N | 113 04 22 W |
| Middle Creek | Stream | | Nez Perce | 46 03 07 N | 116 56 31 W |
| Middle Creek | Stream | | Shoshone | 47 08 14 N | 115 54 13 W |
| Middle Creek | Stream | | Washington | 44 24 21 N | 116 27 25 W |
| Middle Creek Butte | Summit | 2418 | Clark | 44 24 32 N | 112 31 12 W |
| Middle Dairy | Locale | 2035 | Caribou | 42 56 07 N | 111 17 01 W |
| Middle Ditch | Canal | 1446 | Franklin | 42 03 25 N | 111 48 26 W |
| Middle Dry Creek | Stream | | Clark | 44 21 05 N | 112 12 42 W |
| Middle Fork Bear Creek | Stream | | Custer | 43 41 52 N | 113 44 17 W |
| Middle Fork Big Bear Creek | Stream | | Latah | 46 48 38 N | 116 36 55 W |
| Middle Fork Big Creek | Stream | | Shoshone | 47 21 44 N | 116 07 32 W |
| Middle Fork Big Pine Creek | Stream | | Boise | 44 05 46 N | 115 45 28 W |
| Middle Fork Bloomington Creek | Stream | | Bear Lake | 42 10 54 N | 111 32 41 W |
| Middle Fork Boise River | Stream | | Boise | 43 42 48 N | 115 38 08 W |
| Middle Fork Boulder Creek | Stream | | Boundary | 48 33 29 N | 116 11 29 W |
| Middle Fork Campground | Locale | 946 | Lemhi | 45 17 58 N | 114 35 47 W |
| Middle Fork Cherry Creek | Stream | | Bannock | 42 18 31 N | 112 08 31 W |
| Middle Fork Cherry Creek | Stream | | Custer | 43 45 55 N | 113 41 50 W |
| Middle Fork Christian School | School | 937 | Boise | 44 08 30 N | 115 58 13 W |
| Middle Fork Clark Fork | Stream | | Bonner | 48 09 19 N | 116 14 54 W |
| Middle Fork Clarks Fork | Stream | | Idaho | 45 28 05 N | 116 30 33 W |
| Middle Fork Clear Creek | Stream | | Idaho | 46 03 02 N | 115 46 56 W |
| Middle Fork Clearwater River | Stream | | Idaho | 46 08 44 N | 115 58 57 W |
| Middle Fork Clearwater Wild and Scenic River | Park | 1114 | Idaho | 46 30 18 N | 114 47 41 W |
| Middle Fork Corbus Creek | Stream | | Elmore | 43 44 13 N | 115 11 15 W |
| Middle Fork Cottonwood Creek | Stream | | Idaho | 45 17 20 N | 114 53 33 W |
| Middle Fork Deep Creek | Stream | | Latah | 47 00 17 N | 116 55 19 W |
| Middle Fork Devil Creek | Stream | | Owyhee | 42 05 33 N | 115 02 28 W |
| Middle Fork Dry Creek | Stream | | Cassia | 42 20 24 N | 114 12 48 W |
| Middle Fork East River | Stream | | Bonner | 48 22 15 N | 116 49 14 W |
| Middle Fork Eightmile Canyon | Valley | | Clark | 44 03 21 N | 112 59 43 W |
| Middle Fork Elk Creek | Stream | | Valley | 45 08 56 N | 115 30 23 W |
| Middle Fork Elkhorn Creek | Stream | | Valley | 44 37 13 N | 115 17 28 W |
| Middle Fork Grouse Creek | Stream | | Elmore | 43 33 38 N | 115 12 15 W |
| Middle Fork Guard Station | Locale | 1476 | Valley | 44 44 19 N | 115 08 45 W |
| Middle Fork Hannahs Fork | Stream | | Twin Falls | 42 02 08 N | 114 20 04 W |
| Middle Fork Hardtrigger Creek | Stream | | Owyhee | 43 21 21 N | 116 49 30 W |
| Middle Fork Hat Creek | Stream | | Lemhi | 44 52 09 N | 114 07 57 W |
| Middle Fork Hauser Creek | Stream | | Kootenai | 47 48 50 N | 117 00 42 W |
| Middle Fork Hudlow Creek | Stream | | Kootenai | 47 49 14 N | 116 31 34 W |
| Middle Fork Indian Creek | Stream | | Valley | 44 47 48 N | 115 08 00 W |
| Middle Fork Kelly Creek | Stream | | Clearwater | 46 43 50 N | 114 51 37 W |
| Middle Fork Kyle Canyon | Stream | | Butte | 43 54 14 N | 112 52 57 W |
| Middle Fork Lake | Lake | 2375 | Valley | 44 53 39 N | 115 52 48 W |
| Middle Fork Lake Fork | Stream | | Valley | 44 55 16 N | 115 56 12 W |
| Middle Fork Lawson Creek | Stream | | Custer | 44 34 37 N | 114 01 40 W |
| Middle Fork Lime Creek | Stream | | Elmore | 43 27 15 N | 115 08 12 W |
| Middle Fork Little Timber Creek | Stream | | Lemhi | 44 36 19 N | 113 26 47 W |
| Middle Fork Lodge | Locale | 1342 | Custer | 44 43 11 N | 115 00 56 W |
| Middle Fork Mission Creek | Stream | | Benewah | 47 05 55 N | 116 56 45 W |
| Middle Fork Navarre Creek | Stream | | Custer | 43 56 07 N | 113 44 44 W |
| Middle Fork North Canyon | Valley | | Bear Lake | 42 24 11 N | 111 34 58 W |
| Middle Fork North Fork Dennett Creek | Stream | | Washington | 44 34 36 N | 117 04 20 W |
| Middle Fork Owyhee River | Stream | | Owyhee | 42 32 40 N | 117 09 34 W |
| Middle Fork Pass Creek | Stream | | Butte | 44 08 02 N | 112 59 46 W |
| Middle Fork Payette River | Stream | | Boise | 44 06 15 N | 116 00 00 W |
| Middle Fork Peak | Summit | 2734 | Lemhi | 44 57 43 N | 114 39 22 W |
| Middle Fork Peak Campground | Locale | 2378 | Lemhi | 44 57 45 N | 114 38 39 W |
| Middle Fork Picnic Area | Locale | 1049 | Valley | 44 15 26 N | 115 53 19 W |
| Middle Fork Pine Creek | Stream | | Shoshone | 47 25 22 N | 116 16 38 W |
| Middle Fork Red River | Stream | | Idaho | 45 39 29 N | 115 24 47 W |
| Middle Fork Roaring River | Stream | | Elmore | 43 41 18 N | 115 27 05 W |
| Middle Fork Robinson Creek | Stream | | Clearwater | 46 50 06 N | 115 58 10 W |
| Middle Fork Saint Charles Creek | Stream | | Franklin | 42 05 43 N | 111 31 45 W |
| Middle Fork Saint Maries River | Stream | | Shoshone | 47 00 53 N | 116 15 31 W |
| Middle Fork Salmon River | Stream | | Lemhi | 45 17 50 N | 114 35 36 W |
| Middle Fork Salmon Wild and Scenic River | Park | 2075 | Valley | 45 46 08 N | 115 04 57 W |
| Middle Fork School | School | 891 | Valley | 44 39 23 N | 116 26 49 W |
| Middle Fork Scriver Creek | Stream | | Boise | 44 12 11 N | 116 00 18 W |
| Middle Fork Sheridan Creek | Stream | | Clark | 44 30 15 N | 111 43 15 W |
| Middle Fork Shoshone Creek | Stream | | Twin Falls | 42 12 24 N | 114 21 20 W |
| Middle Fork Smith Creek | Stream | | Boise | 43 57 50 N | 115 48 57 W |
| Middle Fork Smith Creek | Stream | | Valley | 45 10 13 N | 115 22 53 W |
| Middle Fork Soldier Creek | Stream | | Boise | 44 05 48 N | 116 15 22 W |
| Middle Fork South Canyon | Valley | | Bear Lake | 42 03 42 N | 111 25 44 W |
| Middle Fork Split Creek | Stream | | Fremont | 44 24 24 N | 111 11 09 W |
| Middle Fork Sturgill Creek | Stream | | Washington | 44 37 10 N | 117 01 37 W |
| Middle Fork Third Fork Rock Creek | Stream | | Cassia | 42 10 58 N | 114 15 08 W |
| Middle Fork Thorn Creek | Stream | | Boise | 43 44 41 N | 115 50 03 W |
| Middle Fork Tom Beall Creek | Stream | | Nez Perce | 46 26 49 N | 116 45 26 W |
| Middle Fork Toponce Creek | Stream | | Caribou | 42 52 58 N | 112 03 53 W |
| Middle Fork Trail | Trail | 2284 | Clark | 44 31 10 N | 111 43 20 W |
| Middle Fork Trailhead | Locale | 1220 | Lemhi | 45 18 03 N | 114 37 12 W |
| Middle Fork Warm Springs Creek | Stream | | Blaine | 43 36 35 N | 114 36 07 W |
| Middle Fork Warm Springs Creek | Stream | | Valley | 44 19 33 N | 115 35 58 W |
| Middle Fork Weiser River | Stream | | Valley | 44 40 06 N | 116 29 04 W |
| Middle Idaho Falls Dam | Dam | 1426 | Bonneville | 43 29 48 N | 112 02 33 W |
| Middle Kirby Rapids | Rapids | 364 | Idaho | 45 35 04 N | 116 29 01 W |
| Middle Knob Lake | Lake | 2116 | Idaho | 45 37 34 N | 115 54 52 W |
| Middle Lake | Lake | 2398 | Valley | 45 02 06 N | 115 25 56 W |