Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Unity Church | Church | 1284 | Cassia | 42 29 37 N | 113 44 42 W |
| Unity Mine | Mine | 1939 | Idaho | 45 15 29 N | 115 40 58 W |
| Univ of Idaho Agr Experiment Station | School | 1881 | Teton | 43 51 24 N | 111 16 39 W |
| Univ of Idaho Agr Experimental Station | Locale | 759 | Canyon | 43 37 04 N | 116 41 26 W |
| Univ of Idaho Agriculture Experiment Station | School | 702 | Canyon | 43 48 04 N | 116 56 37 W |
| University of Idaho | School | 806 | Latah | 46 43 33 N | 117 00 41 W |
| University of Idaho Clark Fork Field Campus | School | 662 | Bonner | 48 08 59 N | 116 09 12 W |
| University of Idaho Experimental Forest | Reserve | 1000 | Latah | 46 47 54 N | 116 48 46 W |
| University of Idaho Heliport | Airport | 794 | Latah | 46 43 38 N | 117 01 26 W |
| University Point | Cape | 660 | Kootenai | 47 30 13 N | 116 52 06 W |
| Unknown Gulch | Valley | | Shoshone | 47 34 34 N | 115 55 45 W |
| Up-River Elementary-Junior High School | School | 837 | Benewah | 47 06 48 N | 116 23 21 W |
| Uphill Water Hole | Spring | 1722 | Lincoln | 43 10 05 N | 114 34 26 W |
| Upper Antelope Reservoir | Reservoir | 1714 | Owyhee | 42 02 30 N | 116 20 37 W |
| Upper Arcadia Reservoir | Reservoir | 1656 | Fremont | 44 08 32 N | 111 35 45 W |
| Upper Baron Lake | Lake | 2525 | Boise | 44 04 40 N | 114 59 49 W |
| Upper Basin | Basin | 1072 | Clearwater | 46 53 22 N | 116 08 54 W |
| Upper Battle Creek Crossing | Locale | 1737 | Owyhee | 42 28 41 N | 116 19 24 W |
| Upper Bear Lake | Lake | 2080 | Idaho | 46 05 44 N | 114 28 14 W |
| Upper Bernard Creek Rapids | Rapids | 409 | Idaho | 45 24 07 N | 116 36 48 W |
| Upper Birch Spring | Spring | 1600 | Owyhee | 42 50 08 N | 116 22 53 W |
| Upper Box Canyon Lake | Lake | 2952 | Blaine | 43 43 46 N | 114 04 09 W |
| Upper Brown Canyon | Valley | | Custer | 43 48 53 N | 113 39 26 W |
| Upper Burnt Creek Reservoir | Reservoir | 1701 | Twin Falls | 42 18 36 N | 114 27 39 W |
| Upper Butcher Bar | Bar | 500 | Idaho | 45 32 56 N | 116 18 25 W |
| Upper Cache Creek Rapids | Rapids | 263 | Nez Perce | 45 58 54 N | 116 53 57 W |
| Upper Canal | Canal | 1390 | Franklin | 42 02 12 N | 111 52 57 W |
| Upper Cannon Lake | Lake | 2472 | Idaho | 45 19 23 N | 116 31 38 W |
| Upper Cedar Creek | Stream | | Custer | 43 57 27 N | 113 40 15 W |
| Upper Center Point Canal | Canal | 705 | Canyon | 43 42 13 N | 116 46 17 W |
| Upper Coal Pit Spring | Spring | 2179 | Cassia | 42 14 17 N | 114 10 49 W |
| Upper Coffee Pot Campground | Locale | 1944 | Fremont | 44 29 28 N | 111 21 57 W |
| Upper Cramer Lake | Lake | 2556 | Custer | 44 01 49 N | 114 59 13 W |
| Upper Crossing | Populated Place | 1361 | Idaho | 45 38 40 N | 114 42 25 W |
| Upper Crystal Spring | Spring | 2000 | Clark | 44 12 06 N | 112 42 33 W |
| Upper Dairy | Locale | 2060 | Caribou | 42 56 51 N | 111 15 36 W |
| Upper Dale School | Locale | 1060 | Adams | 44 48 58 N | 116 34 58 W |
| Upper Deadwood Guard Station (historical) | Locale | 1708 | Valley | 44 26 13 N | 115 35 24 W |
| Upper Declaration Trail | Trail | 1311 | Bonner | 47 55 40 N | 116 20 36 W |
| Upper Deep Creek Dam | Dam | 1623 | Oneida | 42 11 34 N | 112 08 48 W |
| Upper Deep Creek Reservoir | Reservoir | 1623 | Oneida | 42 11 34 N | 112 08 48 W |
| Upper Deer Flat | Flat | 784 | Canyon | 43 29 14 N | 116 36 02 W |
| Upper Deer Flat | Flat | 776 | Canyon | 43 30 32 N | 116 35 52 W |
| Upper Deer Flat Fire Station | Building | 788 | Canyon | 43 29 19 N | 116 34 57 W |
| Upper Dry Valley | Valley | | Caribou | 42 39 52 N | 111 17 03 W |
| Upper Duncan Creek Dam | Dam | 1784 | Owyhee | 42 24 23 N | 116 04 02 W |
| Upper East Fork Shoofly Reservoir | Reservoir | 1761 | Owyhee | 42 40 57 N | 116 15 36 W |
| Upper Embankment Drain | Stream | 746 | Canyon | 43 34 55 N | 116 38 43 W |
| Upper Fairview School | Locale | 780 | Ada | 43 39 36 N | 116 25 57 W |
| Upper Fall Creek Spring | Spring | 1841 | Cassia | 42 22 32 N | 113 04 06 W |
| Upper Fishook Research Natural Area | Park | 1378 | Shoshone | 47 07 08 N | 115 51 32 W |
| Upper Glidden Lake | Lake | 1798 | Shoshone | 47 31 02 N | 115 43 07 W |
| Upper Goose Lake | Reservoir | 1882 | Fremont | 44 06 12 N | 111 06 43 W |
| Upper Gospel Lake | Lake | 2196 | Idaho | 45 37 49 N | 115 57 06 W |
| Upper Gospel Lake Viewpoint | Locale | 2371 | Idaho | 45 37 40 N | 115 56 54 W |
| Upper Grouse Campground | Locale | 1175 | Lemhi | 44 52 15 N | 114 46 07 W |
| Upper Harden Creek | Stream | | Custer | 44 15 48 N | 114 47 30 W |
| Upper Hazard Lake | Lake | 2265 | Idaho | 45 10 25 N | 116 08 06 W |
| Upper Heglar Spring | Spring | 1918 | Cassia | 42 24 58 N | 113 00 18 W |
| Upper Hogpen Spring | Spring | 1430 | Owyhee | 42 51 06 N | 116 23 37 W |
| Upper Holmes Lateral | Canal | 1449 | Bonneville | 43 32 50 N | 112 04 35 W |
| Upper Idaho Falls Number One Dam | Dam | 1445 | Bonneville | 43 33 24 N | 112 02 57 W |
| Upper Idaho Falls Number Two Dam | Dam | 1444 | Bonneville | 43 33 18 N | 112 03 03 W |
| Upper Jackass Flat Campground | Locale | 1312 | Custer | 44 43 27 N | 114 58 13 W |
| Upper John G Reservoir | Reservoir | 1577 | Owyhee | 42 07 02 N | 116 50 28 W |
| Upper Jug Creek Reservoir | Reservoir | 1697 | Valley | 44 50 35 N | 115 59 57 W |
| Upper Kirby Rapids | Rapids | 364 | Idaho | 45 34 55 N | 116 28 57 W |
| Upper Knob Lake | Lake | 2311 | Idaho | 45 37 09 N | 115 55 14 W |
| Upper Lake Fork Spring | Spring | 1841 | Cassia | 42 23 33 N | 113 02 16 W |
| Upper Lodgepole Meadow | Flat | 2110 | Idaho | 45 18 24 N | 115 12 50 W |
| Upper Loon Creek-US Forest Service Airport | Airport | 1763 | Custer | 44 33 07 N | 114 50 56 W |
| Upper Lost Valley Spring | Spring | 1719 | Owyhee | 42 23 30 N | 116 15 50 W |
| Upper Mesa Falls | Falls | 1711 | Fremont | 44 11 17 N | 111 19 48 W |
| Upper North Fork Grouse Creek Trail | Trail | 1410 | Boundary | 48 31 02 N | 116 16 26 W |
| Upper O'brien Campground | Locale | 1784 | Custer | 44 15 34 N | 114 41 54 W |
| Upper Pahsimeroi Recreation Site | Locale | 2486 | Custer | 44 07 45 N | 113 43 36 W |
| Upper Palisades Lake | Lake | 2097 | Bonneville | 43 26 15 N | 111 07 14 W |
| Upper Payette Campground | Locale | 1695 | Valley | 45 07 32 N | 116 01 35 W |
| Upper Payette Lake | Reservoir | 1694 | Valley | 45 06 40 N | 116 01 35 W |
| Upper Payette Lake Campground | Locale | 1703 | Valley | 45 07 22 N | 116 01 44 W |
| Upper Payette Lake Dam | Dam | 1694 | Valley | 45 06 40 N | 116 01 35 W |
| Upper Penstemon Campground | Locale | 2035 | Twin Falls | 42 11 40 N | 114 17 09 W |
| Upper Pittsburg Landing | Locale | 367 | Idaho | 45 37 32 N | 116 28 16 W |
| Upper Pittsburgh Landing | Locale | 396 | Idaho | 45 37 00 N | 116 27 42 W |
| Upper Piute Creek Reservoir | Reservoir | 1609 | Owyhee | 42 08 32 N | 116 34 34 W |
| Upper Pleasant Valley Rapids | Rapids | 343 | Idaho | 45 38 32 N | 116 29 02 W |
| Upper Pleasantview Reservoir | Reservoir | 1432 | Oneida | 42 12 23 N | 112 22 00 W |
| Upper Portneuf Access Area | Locale | 1580 | Bannock | 42 42 44 N | 112 00 54 W |
| Upper Priest Falls | Falls | 1060 | Boundary | 48 59 36 N | 116 56 29 W |
| Upper Priest Lake | Lake | 744 | Bonner | 48 47 09 N | 116 53 22 W |
| Upper Priest Lake Scenic Area | Locale | 744 | Bonner | 48 47 30 N | 116 53 04 W |
| Upper Priest River | Stream | | Bonner | 48 47 56 N | 116 54 43 W |
| Upper Raft River Valley | Valley | | Cassia | 42 03 37 N | 113 29 13 W |
| Upper Ramey Meadows | Flat | 2172 | Idaho | 45 17 13 N | 115 13 19 W |
| Upper Rats Nest Spring | Spring | 1215 | Owyhee | 43 23 19 N | 116 48 58 W |
| Upper Rattlesnake Reservoir | Reservoir | 1761 | Owyhee | 42 18 36 N | 116 00 43 W |
| Upper Red Top Meadows | Flat | 1858 | Idaho | 45 20 46 N | 115 18 53 W |
| Upper Redfish Lakes | Lake | 2561 | Custer | 44 02 46 N | 115 01 40 W |
| Upper Rock Creek | Stream | | Bannock | 42 44 43 N | 112 12 58 W |
| Upper Salmon Falls | Falls | 875 | Twin Falls | 42 46 00 N | 114 53 50 W |
| Upper Salmon Falls Dam | Dam | 879 | Gooding | 42 45 54 N | 114 53 45 W |
| Upper Salmon Falls Reservoir | Reservoir | 879 | Gooding | 42 45 54 N | 114 53 45 W |
| Upper Seven-Hundred Reservoir | Reservoir | 1687 | Lincoln | 43 11 25 N | 114 29 53 W |
| Upper Sherwin Bar | Bar | 494 | Idaho | 45 35 32 N | 116 17 13 W |
| Upper Slate Creek Trail | Trail | 1124 | Shoshone | 47 24 37 N | 115 58 02 W |
| Upper Slate Lake | Lake | 2182 | Idaho | 45 35 34 N | 115 56 54 W |
| Upper Slope Reservoir | Reservoir | 1745 | Owyhee | 42 40 29 N | 116 12 23 W |
| Upper Spring | Spring | 1680 | Bannock | 42 37 00 N | 111 57 40 W |
| Upper Spring | Spring | 2022 | Bingham | 43 14 48 N | 111 42 21 W |
| Upper Spring | Spring | 1612 | Oneida | 42 09 59 N | 112 29 43 W |