Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Judith River Bridge | Bridge | 1007 | Fergus | 47 14 27 N | 109 40 52 W |
| Judith River Game Range Headquarters | Locale | 1525 | Judith Basin | 46 52 56 N | 110 17 08 W |
| Judith River Historical Marker | Park | 1235 | Judith Basin | 47 00 60 N | 109 52 23 W |
| Judith River Ridge | Ridge | 1114 | Blaine | 48 00 16 N | 108 24 51 W |
| Judith River State Wildlife Management Area | Park | 1582 | Judith Basin | 46 53 11 N | 110 18 20 W |
| Judith School (historical) | School | 1438 | Fergus | 47 06 20 N | 109 18 42 W |
| Judy Creek | Stream | | Teton | 48 05 19 N | 112 57 29 W |
| Judy Dam | Dam | 687 | Valley | 48 05 00 N | 106 49 20 W |
| Judy Reservoir | Reservoir | 685 | Valley | 48 04 54 N | 106 49 22 W |
| Jug Creek | Stream | | Madison | 44 58 36 N | 111 58 40 W |
| Jule Creek | Stream | | Glacier | 48 59 15 N | 113 36 50 W |
| Julia Lee Mine | Mine | 1881 | Madison | 45 40 37 N | 112 23 30 W |
| Julia Mine | Mine | 2076 | Powell | 46 27 58 N | 112 22 52 W |
| Julia Mine | Mine | 2006 | Powell | 46 27 60 N | 112 22 38 W |
| Julian (historical) | Populated Place | 745 | Daniels | 48 56 33 N | 105 21 32 W |
| Julian Erickson School (historical) | School | 745 | Daniels | 48 56 33 N | 105 21 32 W |
| Julian Post Office (historical) | Post Office | 745 | Daniels | 48 56 33 N | 105 21 32 W |
| Julian Ranch | Locale | 1577 | Park | 45 59 29 N | 110 34 49 W |
| Juliet Creek | Stream | | Flathead | 47 43 50 N | 113 12 02 W |
| Julius Gulch | Valley | | Deer Lodge | 45 57 05 N | 112 59 48 W |
| July Creek | Stream | | Lincoln | 48 26 06 N | 115 57 15 W |
| Jumbo | Mine | 1776 | Lewis and Clark | 46 28 33 N | 112 14 33 W |
| Jumbo Creek | Stream | | Powell | 47 23 33 N | 113 12 22 W |
| Jumbo Lake | Lake | 2561 | Gallatin | 45 21 60 N | 111 15 54 W |
| Jumbo Lake | Lake | 1013 | Lincoln | 48 40 02 N | 114 47 06 W |
| Jumbo Lookout Trail | Trail | 1859 | Powell | 47 24 38 N | 113 08 14 W |
| Jumbo Mine | Mine | 1785 | Granite | 46 35 41 N | 113 36 04 W |
| Jumbo Mine | Mine | 1473 | Lake | 47 57 11 N | 114 21 35 W |
| Jumbo Mine | Mine | 1509 | Lincoln | 48 02 44 N | 115 32 18 W |
| Jumbo Mine | Mine | 1566 | Lincoln | 48 02 42 N | 115 32 23 W |
| Jumbo Mine | Mine | 1795 | Meagher | 46 38 31 N | 110 25 12 W |
| Jumbo Mountain | Summit | 2970 | Beaverhead | 45 27 16 N | 113 44 21 W |
| Jumbo Mountain | Summit | 3175 | Gallatin | 45 21 21 N | 111 17 03 W |
| Jumbo Mountain | Summit | 2507 | Powell | 47 23 45 N | 113 09 54 W |
| Jumbo Number 1 Dam | Dam | 862 | Phillips | 48 58 18 N | 107 46 08 W |
| Jumbo Peak | Summit | 1637 | Lincoln | 47 59 12 N | 115 22 16 W |
| Jump Off Peak | Summit | 2285 | Fergus | 46 48 21 N | 109 26 60 W |
| Jumping Creek | Stream | | Meagher | 46 45 53 N | 110 46 56 W |
| Jumping Creek Campground | Locale | 1798 | Meagher | 46 45 50 N | 110 47 08 W |
| Jumping Horse Stock Ranch | Locale | 1616 | Madison | 45 23 05 N | 111 37 14 W |
| Junction | Populated Place | 1654 | Madison | 45 19 25 N | 111 59 50 W |
| Junction (historical) | Locale | 604 | Roosevelt | 48 09 19 N | 104 14 48 W |
| Junction Creek | Stream | | Beaverhead | 44 39 36 N | 112 35 35 W |
| Junction Mountain | Summit | 2649 | Lewis and Clark | 47 30 57 N | 113 07 23 W |
| Junction of the Hell Gate and Big Blackfoot Rivers Historical Marker | Park | 1000 | Missoula | 46 52 34 N | 113 53 33 W |
| Junction Post Office (historical) | Post Office | 1654 | Madison | 45 19 25 N | 111 59 50 W |
| Junction Ranch Post Office (historical) | Post Office | 2004 | Beaverhead | 44 36 13 N | 112 28 04 W |
| Juncus Lake | Lake | 2525 | Gallatin | 44 54 60 N | 111 17 33 W |
| Junes House Assisted Living | Hospital | 1159 | Lewis and Clark | 46 37 48 N | 112 01 55 W |
| Jung Fraction Mine | Mine | 2196 | Beaverhead | 45 00 15 N | 113 20 38 W |
| Jungle Creek | Stream | | Flathead | 47 53 19 N | 113 28 59 W |
| Jungle Creek | Stream | | Lincoln | 48 58 07 N | 115 51 55 W |
| Jungle Creek | Stream | | Park | 45 25 00 N | 110 25 01 W |
| Jungle Creek | Stream | | Sanders | 47 43 34 N | 115 03 20 W |
| Junior Hyalite Camp | Locale | 2059 | Gallatin | 45 28 45 N | 110 57 35 W |
| Juniors Place Dam | Dam | 716 | Richland | 48 03 06 N | 104 43 08 W |
| Juniper Campground | Locale | 1108 | Lewis and Clark | 46 58 08 N | 111 57 28 W |
| Juniper Dam | Dam | 708 | Dawson | 46 54 41 N | 104 41 32 W |
| Juniper Reservoir | Reservoir | 999 | Blaine | 47 53 05 N | 109 06 42 W |
| Juniper Spring | Spring | 1146 | Chouteau | 48 01 40 N | 109 34 43 W |
| Juniper Spring Gulch | Valley | | Beaverhead | 45 06 24 N | 112 50 58 W |
| Juno Gulch | Valley | | Granite | 46 21 46 N | 113 38 13 W |
| Jupiter Dam | Dam | 924 | Hill | 48 52 18 N | 109 58 03 W |
| Jupiter Mine | Mine | 2610 | Park | 45 02 30 N | 110 35 53 W |
| Jurica Number 1 Dam | Dam | 893 | Powder River | 45 39 24 N | 105 15 56 W |
| Jurica School (historical) | School | 874 | Powder River | 45 41 26 N | 105 13 38 W |
| Just Barely Dam | Dam | 1014 | Pondera | 48 02 54 N | 111 24 51 W |
| Justice Mine | Mine | 1510 | Fergus | 47 10 34 N | 109 13 46 W |
| Justice Mine | Mine | 1896 | Lewis and Clark | 46 28 23 N | 112 17 03 W |
| Justisson Ditch | Canal | 1301 | Lewis and Clark | 46 47 47 N | 112 14 12 W |
| K 2 Ditch | Canal | 1120 | Pondera | 48 20 02 N | 111 55 18 W |
| K 7 Ditch | Canal | 1071 | Pondera | 48 21 50 N | 111 55 11 W |
| K 9 Ditch | Canal | 1080 | Pondera | 48 22 02 N | 111 55 55 W |
| K and L McDowell Number 3 Dam | Dam | 1048 | Carter | 45 06 24 N | 104 32 20 W |
| K and L McDowell Number 5 Dam | Dam | 1050 | Carter | 45 06 42 N | 104 29 38 W |
| K and L McDowell Number 7 Dam | Dam | 1045 | Carter | 45 05 06 N | 104 27 44 W |
| K Bar Creek | Stream | | Carter | 45 37 14 N | 103 56 03 W |
| K Canal | Canal | 1001 | Lake | 47 11 38 N | 114 03 42 W |
| K Canal | Canal | 1172 | Pondera | 48 23 17 N | 112 22 07 W |
| K Ditch | Canal | 1082 | Pondera | 48 21 01 N | 111 56 38 W |
| K L Clark Number 1 Dam | Dam | 1157 | Yellowstone | 45 55 54 N | 108 45 03 W |
| K L Ranch | Locale | 1451 | Lewis and Clark | 47 37 54 N | 112 51 33 W |
| K Ross Toole Fishing Access Site | Locale | 1033 | Missoula | 46 54 14 N | 113 43 33 W |
| K W Bergan Elementary School | School | 1334 | Glacier | 48 33 25 N | 113 00 48 W |
| K William Harvey Elementary School | School | 932 | Lake | 47 31 52 N | 114 06 18 W |
| K Williams Natural Trail Area | Park | 977 | Missoula | 46 51 48 N | 113 58 35 W |
| K-G Elementary School | School | 872 | Hill | 48 34 10 N | 110 05 11 W |
| K-G High School | School | 861 | Hill | 48 34 20 N | 110 17 54 W |
| K-W Feed and Grain Elevator | Locale | 1239 | Sweet Grass | 45 50 15 N | 109 57 23 W |
| KAAK-FM (Great Falls) | Tower | 1085 | Cascade | 47 32 08 N | 111 17 05 W |
| Kabo Post Office (historical) | Post Office | 968 | Blaine | 47 46 46 N | 109 29 15 W |
| Kabo School (historical) | School | 778 | Chouteau | 47 45 57 N | 109 41 26 W |
| Kachia Post Office (historical) | Post Office | 904 | Fergus | 47 23 17 N | 108 34 50 W |
| Kachia Reservoir | Reservoir | 897 | Fergus | 47 23 29 N | 108 34 53 W |
| Kachia School (historical) | School | 928 | Fergus | 47 22 54 N | 108 34 17 W |
| Kade Creek | Stream | | Teton | 47 46 45 N | 112 31 47 W |
| Kading Ranger Station | Locale | 1852 | Powell | 46 25 49 N | 112 28 49 W |
| Kady Gulch | Valley | | Jefferson | 46 23 06 N | 112 08 00 W |
| KAFM-FM (Red Lodge) | Tower | 2861 | Carbon | 45 10 47 N | 109 21 23 W |
| KAFM-FM (Red Lodge) | Tower | 1694 | Carbon | 45 11 15 N | 109 14 49 W |
| Kah Lookout | Locale | 1943 | Flathead | 47 59 32 N | 113 39 38 W |
| Kah Mountain | Summit | 1967 | Flathead | 48 00 25 N | 113 40 35 W |
| Kahle (historical) | Populated Place | 729 | Daniels | 48 34 48 N | 105 28 14 W |
| Kahle Post Office (historical) | Post Office | 729 | Daniels | 48 34 48 N | 105 28 14 W |
| Kahler Chiropractic Health Center | Hospital | 922 | Flathead | 48 24 38 N | 114 20 21 W |
| Kahn Coulee | Valley | | Hill | 48 55 47 N | 109 41 03 W |
| Kahoka Mine | Mine | 1671 | Broadwater | 46 11 37 N | 111 42 46 W |
| Kaina Creek | Stream | | Glacier | 48 55 02 N | 113 46 14 W |
| Kaina Lake | Lake | 2094 | Glacier | 48 56 30 N | 113 48 18 W |
| Kaina Mountain | Summit | 2649 | Glacier | 48 57 19 N | 113 47 56 W |