Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Ernest Creek | Stream | | Powder River | 45 16 31 N | 105 36 17 W |
| Ernest Dam | Dam | 807 | Phillips | 48 11 48 N | 108 17 44 W |
| Ernest Miller Ridge | Ridge | 2983 | Gallatin | 44 56 42 N | 111 08 17 W |
| Ernest Wallstein Dam | Dam | 939 | Carter | 45 49 42 N | 104 04 20 W |
| Ernie Hudson Dam | Dam | 1254 | Stillwater | 46 28 48 N | 109 35 03 W |
| Ernie Number 1 Dam | Dam | 1118 | Musselshell | 46 35 18 N | 108 44 51 W |
| Erosion Creek | Stream | | Teton | 47 44 03 N | 112 44 53 W |
| Erphit Lake | Lake | 687 | Phillips | 48 28 50 N | 107 39 45 W |
| Erphit Spring | Spring | 693 | Phillips | 48 28 54 N | 107 39 53 W |
| Erphit Spring | Spring | 688 | Phillips | 48 28 51 N | 107 39 52 W |
| Erratic Lake | Lake | 3120 | Carbon | 45 03 27 N | 109 40 19 W |
| Erskine Bridge (historical) | Bridge | 1463 | Gallatin | 45 39 50 N | 111 09 13 W |
| Erskine Fishing Access Site | Locale | 956 | Missoula | 47 00 24 N | 114 17 09 W |
| Erskine Sportsmans Access | Locale | 921 | Missoula | 47 01 01 N | 114 16 39 W |
| Ervin Ridge | Ridge | 956 | Blaine | 47 49 11 N | 109 06 04 W |
| Ervine Cemetery | Cemetery | 762 | McCone | 47 45 27 N | 105 45 30 W |
| Erwin Bridge Fishing Access Site | Locale | 1351 | Gallatin | 45 46 26 N | 111 14 23 W |
| Erwin Creek | Stream | | Judith Basin | 47 19 45 N | 110 34 15 W |
| Eskay (historical) | Populated Place | 938 | Chouteau | 47 49 48 N | 109 38 10 W |
| Eskay Post Office (historical) | Post Office | 938 | Chouteau | 47 49 48 N | 109 38 10 W |
| Eskay School (historical) | School | 958 | Chouteau | 47 50 53 N | 109 40 32 W |
| Eskimo Creek | Stream | | Big Horn | 45 00 49 N | 107 36 37 W |
| Esmeralda Hill | Summit | 2123 | Powell | 46 41 15 N | 112 25 50 W |
| Esp Ditch | Canal | 1273 | Sweet Grass | 45 45 01 N | 109 52 23 W |
| Espeil Coulee | Valley | | Valley | 48 09 39 N | 106 26 23 W |
| Espeland-Ostrum-George Ditch | Canal | 1524 | Carbon | 45 22 13 N | 109 29 32 W |
| Esplin Lake | Lake | 2117 | Ravalli | 45 47 34 N | 114 29 20 W |
| Essex | Locale | 1181 | Flathead | 48 16 48 N | 113 36 43 W |
| Essex | Populated Place | 1179 | Flathead | 48 16 41 N | 113 36 45 W |
| Essex Creek | Stream | | Flathead | 48 16 43 N | 113 36 23 W |
| Essex Cross Country Ski Area | Locale | 1200 | Flathead | 48 16 26 N | 113 37 29 W |
| Essex Mountain | Summit | 2126 | Flathead | 48 15 52 N | 113 39 50 W |
| Essex Post Office | Post Office | 1168 | Flathead | 48 17 50 N | 113 36 55 W |
| Essex School (historical) | School | 1178 | Flathead | 48 16 45 N | 113 36 39 W |
| Essinger Reservoir Dam | Dam | 807 | McCone | 47 20 00 N | 105 49 14 W |
| Estelle Lake | Lake | 2799 | Carbon | 45 01 42 N | 109 40 23 W |
| Ester Lake | Lake | 804 | Phillips | 48 05 52 N | 108 15 29 W |
| Ester Lake Dam | Dam | 805 | Phillips | 48 05 60 N | 108 15 08 W |
| Ester Lake School (historical) | School | 820 | Phillips | 48 05 38 N | 108 17 02 W |
| Ester Reservoir Fishing Access Site | Locale | 804 | Phillips | 48 05 59 N | 108 15 14 W |
| Estes Lake | Lake | 1077 | Lake | 48 00 24 N | 114 01 49 W |
| Estler Creek | Stream | | Beaverhead | 45 22 33 N | 112 58 46 W |
| Estler Lake | Reservoir | 2397 | Beaverhead | 45 22 18 N | 112 58 23 W |
| Estler Lake Dam | Dam | 2397 | Beaverhead | 45 22 18 N | 112 58 21 W |
| Etchart Cow Camp | Locale | 707 | Valley | 47 45 28 N | 107 19 14 W |
| Etchart Dam | Dam | 805 | Valley | 48 47 48 N | 106 45 02 W |
| Etchart Field | Airport | 657 | Valley | 48 19 00 N | 106 50 04 W |
| Etchart Stone House | Locale | 865 | Valley | 47 53 08 N | 107 13 56 W |
| Etchetah (historical) | Populated Place | 822 | Treasure | 46 12 13 N | 107 26 27 W |
| Etchetah Post Office (historical) | Post Office | 822 | Treasure | 46 12 13 N | 107 26 27 W |
| Etchetah School (historical) | School | 821 | Treasure | 46 13 03 N | 107 26 25 W |
| Ethel Gulch | Valley | | Lewis and Clark | 46 52 37 N | 112 36 42 W |
| Ethel Post Office (historical) | Post Office | 1214 | Musselshell | 46 10 48 N | 108 38 58 W |
| Ethel Reservoir | Reservoir | 774 | Phillips | 48 57 30 N | 107 36 33 W |
| Ethels Coulee | Valley | | Wheatland | 46 23 29 N | 109 37 47 W |
| Ethridge | Locale | 1081 | Toole | 48 33 24 N | 112 07 27 W |
| Ethridge | Populated Place | 1081 | Toole | 48 33 28 N | 112 07 14 W |
| Ethridge Gulch | Valley | | Granite | 46 19 34 N | 113 32 23 W |
| Ethridge Post Office | Post Office | 1081 | Toole | 48 33 24 N | 112 07 27 W |
| Ethridge School (historical) | School | 1081 | Toole | 48 33 24 N | 112 07 27 W |
| Etna (historical) | Populated Place | 752 | Custer | 46 11 15 N | 105 46 52 W |
| Etna (historical) | Populated Place | 1020 | Ravalli | 46 26 10 N | 114 05 03 W |
| Etna Post Office (historical) | Post Office | 752 | Custer | 46 11 15 N | 105 46 52 W |
| Etna Post Office (historical) | Post Office | 1020 | Ravalli | 46 26 10 N | 114 05 03 W |
| Etna School (historical) | School | 1021 | Ravalli | 46 25 53 N | 114 05 47 W |
| Etta Reservoir | Reservoir | 1063 | Carter | 45 39 25 N | 104 14 30 W |
| Ettien Gulch | Valley | | Judith Basin | 46 50 47 N | 110 19 22 W |
| Ettien Ridge | Ridge | 2160 | Judith Basin | 46 47 30 N | 110 23 41 W |
| Ettien Spring | Spring | 1977 | Judith Basin | 46 47 55 N | 110 22 38 W |
| Eudora Post Office (historical) | Post Office | 961 | Lake | 47 48 55 N | 114 28 33 W |
| Eugene S Number 1 Dam | Dam | 717 | McCone | 47 46 18 N | 105 30 02 W |
| Eunice Creek | Stream | | Beaverhead | 45 06 24 N | 113 26 47 W |
| Eureka | Locale | 783 | Lincoln | 48 52 35 N | 115 03 14 W |
| Eureka | Mine | 1893 | Lewis and Clark | 46 28 23 N | 112 14 23 W |
| Eureka | Populated Place | 787 | Lincoln | 48 52 48 N | 115 03 13 W |
| Eureka Airport | Airport | 824 | Lincoln | 48 58 07 N | 115 04 17 W |
| Eureka Basin | Basin | 2446 | Madison | 44 48 07 N | 111 56 27 W |
| Eureka Branch Library | Building | 792 | Lincoln | 48 52 52 N | 115 03 12 W |
| Eureka Cemetery | Cemetery | 802 | Lincoln | 48 54 17 N | 115 05 60 W |
| Eureka Christian Center | Church | 794 | Lincoln | 48 52 58 N | 115 03 04 W |
| Eureka Community Church | Church | 791 | Lincoln | 48 52 51 N | 115 03 07 W |
| Eureka Creek | Stream | | Blaine | 48 28 52 N | 108 24 53 W |
| Eureka Creek | Stream | | Broadwater | 46 19 11 N | 111 45 21 W |
| Eureka Fire Department | Building | 786 | Lincoln | 48 52 45 N | 115 03 09 W |
| Eureka Gulch | Valley | | Granite | 46 19 23 N | 113 34 35 W |
| Eureka Gulch | Valley | | Granite | 46 37 04 N | 113 25 38 W |
| Eureka Gulch | Valley | | Powell | 46 38 18 N | 112 32 23 W |
| Eureka Hill | Summit | 967 | Lincoln | 48 51 17 N | 115 03 07 W |
| Eureka Mine | Mine | 2314 | Jefferson | 46 10 03 N | 112 16 33 W |
| Eureka Mine | Mine | 2331 | Jefferson | 46 10 03 N | 112 16 35 W |
| Eureka Mine | Mine | 1582 | Jefferson | 46 21 15 N | 112 05 03 W |
| Eureka Mine | Mine | 1675 | Jefferson | 46 16 07 N | 112 17 06 W |
| Eureka Mine | Mine | 2315 | Jefferson | 46 10 05 N | 112 16 34 W |
| Eureka Police Department | Building | 786 | Lincoln | 48 52 45 N | 115 03 09 W |
| Eureka Post Office | Post Office | 788 | Lincoln | 48 52 51 N | 115 03 09 W |
| Eureka Public Schools | School | 796 | Lincoln | 48 53 05 N | 115 02 59 W |
| Eureka Ranger Station | Locale | 800 | Lincoln | 48 53 45 N | 115 03 30 W |
| Eureka Reservoir | Reservoir | 1260 | Teton | 47 52 42 N | 112 19 04 W |
| Eureka Reservoir | Reservoir | 1075 | Teton | 45 09 42 N | 105 40 02 W |
| Eureka Reservoir Dam | Dam | 1261 | Teton | 47 52 42 N | 112 19 03 W |
| Eureka Reservoir Fishing Access Site | Locale | 1259 | Teton | 47 52 49 N | 112 17 18 W |
| Eureka Reservoir West Dike Dam | Dam | 1075 | Teton | 45 09 42 N | 105 40 02 W |
| Eureka Ridge | Ridge | 2395 | Granite | 46 26 59 N | 113 06 32 W |
| Eureka Ridge Mine | Mine | 2270 | Granite | 46 25 36 N | 113 07 10 W |
| Eureka School (historical) | School | 984 | Fallon | 46 37 25 N | 104 13 52 W |
| Eureka School (historical) | School | 1430 | Jefferson | 45 55 06 N | 111 45 49 W |
| Eureka Seventh Day Adventist Church | Church | 823 | Lincoln | 48 52 45 N | 115 02 39 W |
| Eustache Creek | Stream | | Missoula | 47 14 14 N | 114 43 54 W |
| Eustis | Populated Place | 1231 | Broadwater | 45 59 23 N | 111 27 60 W |
| Eva Horning Park | Park | 839 | Mineral | 47 11 28 N | 114 53 13 W |