Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Endor Creek | Stream | | Flathead | 48 17 57 N | 113 59 22 W |
| Enerson Creek | Stream | | Carter | 45 19 42 N | 104 04 24 W |
| Enerson Creek | Stream | | Carter | 45 19 42 N | 104 04 24 W |
| Eng Cemetery | Cemetery | 725 | Sheridan | 48 29 27 N | 104 43 23 W |
| Eng School (historical) | School | 710 | Roosevelt | 48 29 50 N | 104 47 22 W |
| Engdahl Number 3 Dam | Dam | 882 | Garfield | 47 29 30 N | 107 01 50 W |
| Engdahl Number 4 Dam | Dam | 861 | Garfield | 47 30 36 N | 107 07 32 W |
| Engdahl Number 5 Dam | Dam | 844 | Garfield | 47 32 42 N | 107 07 38 W |
| Engdahl Number 6 Dam | Dam | 808 | Garfield | 47 34 24 N | 107 08 14 W |
| Engdahl Number 7 Dam | Dam | 839 | Garfield | 47 32 24 N | 107 05 44 W |
| Engdall Reservoir Number 1 Dam | Dam | 840 | Garfield | 47 31 36 N | 107 06 44 W |
| Engdall Reservoir Number 2 Dam | Dam | 867 | Garfield | 47 30 12 N | 107 07 20 W |
| Engel Memorial Park | Park | 1021 | Toole | 48 52 50 N | 111 54 27 W |
| Engellant Coulee | Valley | | Chouteau | 47 35 59 N | 109 51 18 W |
| Engine Draw | Valley | | Rosebud | 46 50 47 N | 106 50 06 W |
| Engineering Building | Building | 1760 | Silver Bow | 46 00 42 N | 112 33 25 W |
| Engineering Lab/Classroom Building | Building | 1761 | Silver Bow | 46 00 49 N | 112 33 33 W |
| England Coulee | Valley | | Hill | 48 31 26 N | 110 17 07 W |
| Engle Creek | Stream | | Sanders | 47 59 19 N | 115 42 16 W |
| Engle Lake | Lake | 1857 | Sanders | 48 00 37 N | 115 37 57 W |
| Engle Lake Trail | Trail | 1243 | Sanders | 47 59 04 N | 115 39 18 W |
| Engle Peak | Summit | 2281 | Sanders | 48 00 34 N | 115 37 09 W |
| Engle Peak Trail | Trail | 1623 | Sanders | 48 00 28 N | 115 39 47 W |
| Englebaugh Creek | Stream | | Beaverhead | 45 14 18 N | 113 27 28 W |
| Englejard Creek | Stream | | Beaverhead | 45 21 13 N | 113 26 36 W |
| Englejard Lake | Lake | 2231 | Beaverhead | 45 17 42 N | 113 33 52 W |
| Engles Spring | Spring | 827 | Valley | 48 30 07 N | 106 49 38 W |
| English George Creek | Stream | | Madison | 45 00 49 N | 111 39 51 W |
| English Gulch | Valley | | Deer Lodge | 46 09 09 N | 113 00 02 W |
| Engstrom Dam | Dam | 620 | Sheridan | 48 31 36 N | 104 37 08 W |
| Engstrom Ranch | Locale | 696 | Valley | 48 07 53 N | 106 45 21 W |
| Enid | Populated Place | 734 | Richland | 47 41 44 N | 104 46 47 W |
| Enid (historical) | Locale | 736 | Richland | 47 41 43 N | 104 46 49 W |
| Enid Post Office (historical) | Post Office | 735 | Richland | 47 41 46 N | 104 46 45 W |
| Enid School (historical) | School | 734 | Richland | 47 41 44 N | 104 46 47 W |
| Enkrud Dam | Dam | 729 | Valley | 48 18 36 N | 106 55 50 W |
| Ennis | Populated Place | 1506 | Madison | 45 20 56 N | 111 43 47 W |
| Ennis Cemetery | Cemetery | 1515 | Madison | 45 20 01 N | 111 42 22 W |
| Ennis Cultural Station | Locale | 1696 | Madison | 45 13 08 N | 111 47 40 W |
| Ennis Fire Department | Building | 1506 | Madison | 45 20 56 N | 111 43 47 W |
| Ennis Fishing Access Site | Locale | 1504 | Madison | 45 20 40 N | 111 43 23 W |
| Ennis Grade School | School | 1513 | Madison | 45 20 55 N | 111 43 57 W |
| Ennis High School | School | 1513 | Madison | 45 20 49 N | 111 43 57 W |
| Ennis Lake | Lake | 1469 | Madison | 45 25 52 N | 111 40 48 W |
| Ennis Lake Community Park | Park | 1503 | Madison | 45 20 57 N | 111 43 19 W |
| Ennis Lake Recreation Site | Locale | 1473 | Madison | 45 26 35 N | 111 42 50 W |
| Ennis National Fish Hatchery | Locale | 1688 | Madison | 45 13 01 N | 111 47 31 W |
| Ennis Post Office | Post Office | 1506 | Madison | 45 20 56 N | 111 43 45 W |
| Ennis Recreation Site | Locale | 1500 | Madison | 45 21 23 N | 111 43 26 W |
| Ennis Rodeo Grounds | Locale | 1509 | Madison | 45 21 27 N | 111 44 25 W |
| Ennis-Big Sky Airport | Airport | 1631 | Madison | 45 16 08 N | 111 38 55 W |
| Enos Creek | Stream | | Sweet Grass | 45 35 17 N | 110 06 39 W |
| Enos Mountain | Summit | 2256 | Sweet Grass | 45 34 07 N | 110 03 01 W |
| Enright (historical) | Locale | 1642 | Silver Bow | 45 58 42 N | 112 39 25 W |
| Enright Coulee | Valley | | Valley | 48 22 14 N | 106 25 21 W |
| Enterprise Post Office (historical) | Post Office | 675 | Roosevelt | 48 19 45 N | 104 19 20 W |
| Enterprise Post Office (historical) | Post Office | 739 | Sanders | 47 39 43 N | 115 24 31 W |
| Enterprise School (historical) | School | 688 | Roosevelt | 48 19 56 N | 104 16 55 W |
| Epiphany Dam | Dam | 860 | Hill | 48 37 12 N | 109 41 39 W |
| Episcopal Church of the Incarnation | Church | 1017 | Cascade | 47 30 29 N | 111 17 52 W |
| Episcopalian Congregation | Church | 1225 | Missoula | 47 10 46 N | 113 29 04 W |
| EPS Building | Building | 1498 | Gallatin | 45 39 57 N | 111 02 45 W |
| Epsie | Populated Place | 1025 | Powder River | 45 29 30 N | 105 39 04 W |
| Epstlon Dam | Dam | 746 | Blaine | 48 33 54 N | 109 18 39 W |
| Epworth (historical) | Locale | 633 | Richland | 47 37 23 N | 104 19 30 W |
| Epworth United Methodist Church | Church | 901 | Flathead | 48 11 47 N | 114 18 33 W |
| Equity Co-op Association Elevator | Locale | 901 | Fallon | 46 22 12 N | 104 16 34 W |
| Equity Co-op Association Elevator (historical) | Locale | 611 | Roosevelt | 48 05 30 N | 105 38 37 W |
| Equity Co-Operative Association Elevator | Locale | 721 | Blaine | 48 32 02 N | 108 47 10 W |
| Equity Co-operative Association Elevator | Locale | 687 | Phillips | 48 21 35 N | 107 51 57 W |
| Equity Cooperative Elevator (historical) | Locale | 629 | Valley | 48 03 40 N | 106 02 32 W |
| Equity Supply Company Elevator | Locale | 901 | Flathead | 48 11 45 N | 114 18 46 W |
| Era Spring | Spring | 2039 | Madison | 45 45 09 N | 112 02 22 W |
| Erb Number 1 Dam | Dam | 1073 | Big Horn | 45 25 48 N | 107 55 32 W |
| Erickson (historical) | Locale | 997 | Ravalli | 46 36 55 N | 114 05 20 W |
| Erickson (historical) | Populated Place | 1145 | Pondera | 48 06 49 N | 112 05 27 W |
| Erickson Cemetery | Cemetery | 933 | Liberty | 48 18 52 N | 110 57 04 W |
| Erickson Creek | Stream | | Beaverhead | 44 42 45 N | 113 01 09 W |
| Erickson Dam | Dam | 755 | Richland | 47 49 30 N | 104 27 14 W |
| Erickson L and I Number 5 Dam | Dam | 850 | Rosebud | 46 30 60 N | 107 08 50 W |
| Erickson Number 2 Dam | Dam | 860 | Rosebud | 46 22 36 N | 106 49 14 W |
| Erickson Number 3 Dam | Dam | 809 | Rosebud | 46 24 42 N | 106 53 44 W |
| Erickson Number 4 Dam | Dam | 805 | Rosebud | 46 23 42 N | 106 53 44 W |
| Erickson Ranch | Locale | 843 | Rosebud | 46 34 04 N | 107 11 44 W |
| Erickson Ranch | Locale | 1209 | Teton | 47 56 30 N | 112 17 56 W |
| Erickson Reservoir | Reservoir | 1029 | Powder River | 45 25 54 N | 106 02 24 W |
| Erickson Reservoir | Reservoir | 741 | Richland | 47 49 25 N | 104 27 04 W |
| Erickson School (historical) | School | 1419 | Fergus | 46 55 46 N | 109 10 13 W |
| Erickson School (historical) | School | 1145 | Pondera | 48 06 49 N | 112 05 27 W |
| Erickson School (historical) | School | 848 | Wibaux | 46 56 25 N | 104 09 27 W |
| Erickson Spring | Spring | 1125 | Powder River | 45 26 49 N | 106 01 24 W |
| Ericson Post Office (historical) | Post Office | 986 | Carter | 45 19 28 N | 104 05 12 W |
| Ericson School (historical) | School | 986 | Carter | 45 19 28 N | 104 05 12 W |
| Ericson Spring | Spring | 812 | Valley | 48 20 07 N | 106 28 13 W |
| Erie Dam | Dam | 1089 | Fergus | 47 29 06 N | 109 16 57 W |
| Erie Mine | Mine | 2076 | Beaverhead | 45 11 43 N | 112 56 49 W |
| Erie Mine | Mine | 1857 | Lewis and Clark | 46 45 49 N | 112 20 02 W |
| Erie Reservoir | Reservoir | 842 | Valley | 48 37 25 N | 107 04 42 W |
| Erin (historical) | Locale | 1028 | Liberty | 48 31 02 N | 110 52 33 W |
| Erlice (historical) | Locale | 1337 | Gallatin | 45 49 60 N | 111 07 35 W |
| Erma Number 1 Mine | Mine | 2532 | Park | 45 00 34 N | 109 56 09 W |
| Erma Number 2 Mine | Mine | 2515 | Park | 45 00 30 N | 109 56 06 W |
| Erma Number 3 Mine | Mine | 2482 | Park | 45 00 23 N | 109 55 60 W |
| Erma Number 4 Mine | Mine | 2471 | Park | 45 00 19 N | 109 55 57 W |
| Ermont Gulch | Valley | | Beaverhead | 45 10 51 N | 112 43 40 W |
| Ermont Mill | Mine | 1958 | Beaverhead | 45 15 60 N | 112 55 03 W |
| Ermont Mill | Populated Place | 1963 | Beaverhead | 45 16 01 N | 112 54 56 W |
| Ermont Number 19 Mine | Mine | 2008 | Beaverhead | 45 16 27 N | 112 54 36 W |
| Ermont Number 19 Mine | Mine | 1958 | Beaverhead | 45 15 60 N | 112 55 03 W |
| Ermont Number 2 Mine | Mine | 1949 | Beaverhead | 45 15 58 N | 112 54 54 W |