Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Glasgow Middle School | School | 665 | Valley | 48 11 44 N | 106 37 05 W |
| Glasgow Police Department | Building | 637 | Valley | 48 11 34 N | 106 38 16 W |
| Glasgow Post Office | Post Office | 637 | Valley | 48 11 40 N | 106 38 19 W |
| Glasgow Rest Area | Locale | 686 | Valley | 48 22 11 N | 106 47 37 W |
| Glasgow Sewage Lagoon Dam | Dam | 640 | Valley | 48 11 36 N | 106 37 38 W |
| Glasgow Stock Yards (historical) | Locale | 639 | Valley | 48 11 19 N | 106 37 21 W |
| Glass Hill | Summit | 960 | Valley | 48 52 57 N | 106 15 47 W |
| Glass Lindsay Lakes Lower Reservoir | Reservoir | 1420 | Sweet Grass | 45 59 60 N | 109 50 09 W |
| Glasscock Brothers Number 1 Dam | Dam | 1015 | Garfield | 46 55 54 N | 107 09 26 W |
| Glasscock Brothers Number 2 Dam | Dam | 911 | Rosebud | 46 47 24 N | 107 17 38 W |
| Glasscock Number 1 Dam | Dam | 814 | Custer | 46 29 24 N | 105 38 32 W |
| Glasscock Number 2 Dam | Dam | 730 | Custer | 46 27 06 N | 105 45 44 W |
| Glasscock Reservoir Number 1 Dam | Dam | 839 | Garfield | 46 54 36 N | 106 17 08 W |
| Glasscock Reservoir Number 2 Dam | Dam | 809 | Garfield | 46 57 12 N | 106 15 20 W |
| Glassett (historical) | Locale | 1120 | Mineral | 47 06 45 N | 115 00 33 W |
| Glasslock Brothers Number 3 Dam | Dam | 985 | Garfield | 46 58 42 N | 107 04 26 W |
| Glasston Post Office (historical) | Post Office | 1367 | Sweet Grass | 46 00 10 N | 109 53 10 W |
| Glasston School (historical) | School | 1368 | Sweet Grass | 45 59 52 N | 109 53 19 W |
| Glaus Ranch | Locale | 1738 | Beaverhead | 45 49 56 N | 113 02 46 W |
| Glaze School (historical) | School | 1163 | Petroleum | 46 46 23 N | 108 37 30 W |
| Glazier Ranch | Locale | 1038 | Flathead | 48 10 26 N | 114 28 32 W |
| Gleason (historical) | Locale | 1112 | Lewis and Clark | 46 58 55 N | 112 04 48 W |
| Gleason Creek | Stream | | Powell | 46 47 05 N | 112 35 52 W |
| Gleason Lake | Reservoir | 2019 | Ravalli | 46 17 57 N | 113 53 49 W |
| Gleason Lake Dam | Dam | 2021 | Ravalli | 46 17 60 N | 113 53 51 W |
| Gleason Resort | Locale | 1547 | Teton | 47 52 20 N | 112 40 34 W |
| Glen | Populated Place | 1520 | Beaverhead | 45 28 36 N | 112 41 26 W |
| Glen (historical) | Locale | 1520 | Beaverhead | 45 28 36 N | 112 41 26 W |
| Glen Campground | Locale | 1511 | Madison | 45 28 09 N | 112 40 02 W |
| Glen Creek | Stream | | Lake | 47 55 03 N | 114 02 03 W |
| Glen Creek | Stream | | Lincoln | 48 51 50 N | 114 56 33 W |
| Glen Fishing Access Site | Locale | 1511 | Beaverhead | 45 27 60 N | 112 40 08 W |
| Glen Gulch | Valley | | Lewis and Clark | 47 03 45 N | 112 29 42 W |
| Glen Lake | Lake | 903 | Lincoln | 48 51 51 N | 114 57 04 W |
| Glen Lake | Lake | 2299 | Ravalli | 46 27 10 N | 114 17 14 W |
| Glen Lake Dam | Dam | 903 | Lincoln | 48 51 60 N | 114 56 58 W |
| Glen Lake Fishing Access Site | Locale | 914 | Lincoln | 48 52 26 N | 114 57 04 W |
| Glen Lake Park | Park | 1432 | Gallatin | 45 42 20 N | 111 02 30 W |
| Glen Marie Gulch | Valley | | Lewis and Clark | 46 52 51 N | 112 10 54 W |
| Glen Mine | Mine | 1721 | Madison | 45 29 25 N | 112 38 26 W |
| Glen Post Office (historical) | Post Office | 1520 | Beaverhead | 45 28 36 N | 112 41 26 W |
| Glen Post Office (historical) | Post Office | 944 | Lake | 47 54 60 N | 114 01 43 W |
| Glen Reservoir | Reservoir | 744 | Valley | 47 54 55 N | 106 43 57 W |
| Glen School (historical) | School | 944 | Lake | 47 54 60 N | 114 01 43 W |
| Glenbeg (historical) | Populated Place | 1831 | Jefferson | 46 22 10 N | 112 08 53 W |
| Glenbeg Post Office (historical) | Post Office | 1831 | Jefferson | 46 22 10 N | 112 08 53 W |
| Glencoe Post Office (historical) | Post Office | 785 | Rosebud | 46 18 08 N | 106 51 35 W |
| Glendale | Populated Place | 1716 | Beaverhead | 45 38 31 N | 112 46 23 W |
| Glendale (historical) | Locale | 1574 | Beaverhead | 45 10 42 N | 112 41 05 W |
| Glendale Butte | Summit | 1821 | Broadwater | 46 15 24 N | 111 42 05 W |
| Glendale Colony | Populated Place | 1229 | Glacier | 48 50 40 N | 112 32 43 W |
| Glendale Post Office (historical) | Post Office | 1716 | Beaverhead | 45 38 31 N | 112 46 23 W |
| Glendale Post Office (historical) | Post Office | 1258 | Golden Valley | 46 34 12 N | 109 02 33 W |
| Glendale School | School | 1229 | Glacier | 48 50 40 N | 112 32 43 W |
| Glendale School (historical) | School | 1716 | Beaverhead | 45 38 31 N | 112 46 23 W |
| Glendale School (historical) | School | 1110 | Fergus | 47 14 38 N | 109 53 25 W |
| Glendenning School (historical) | School | 739 | Richland | 47 52 33 N | 104 25 04 W |
| Glendive | Locale | 629 | Dawson | 47 06 23 N | 104 42 39 W |
| Glendive | Populated Place | 629 | Dawson | 47 06 19 N | 104 42 45 W |
| Glendive Airport (historical) | Airport | 648 | Dawson | 47 07 40 N | 104 41 05 W |
| Glendive Butte | Summit | 802 | Dawson | 47 12 30 N | 104 46 12 W |
| Glendive Campground | Locale | 649 | Dawson | 47 07 32 N | 104 41 37 W |
| Glendive Community Hospital (historical) | Hospital | 646 | Dawson | 47 07 03 N | 104 42 12 W |
| Glendive Coulee | Valley | | Richland | 48 03 03 N | 105 09 57 W |
| Glendive Creek | Stream | | Dawson | 47 08 33 N | 104 41 18 W |
| Glendive Evangelical Church | Church | 627 | Dawson | 47 06 30 N | 104 42 40 W |
| Glendive Fire Department | Building | 631 | Dawson | 47 06 10 N | 104 42 55 W |
| Glendive Historical Marker | Park | 624 | Dawson | 47 06 19 N | 104 44 26 W |
| Glendive Medical Center | Hospital | 647 | Dawson | 47 07 03 N | 104 42 14 W |
| Glendive Oil Field | Oilfield | 714 | Dawson | 47 01 23 N | 104 50 25 W |
| Glendive Plaza | Locale | 626 | Dawson | 47 06 26 N | 104 43 32 W |
| Glendive Police Department | Building | 630 | Dawson | 47 06 17 N | 104 42 56 W |
| Glendive Post Office | Post Office | 629 | Dawson | 47 06 23 N | 104 42 49 W |
| Glendive Public Library | Building | 630 | Dawson | 47 06 15 N | 104 42 57 W |
| Glendive Sewage Disposal Ponds Dam | Dam | 644 | Dawson | 47 08 18 N | 104 40 20 W |
| Glendive Sewage Lagoon Dam | Dam | 624 | Dawson | 47 06 42 N | 104 43 44 W |
| Glendive West Rest Area | Locale | 684 | Dawson | 46 53 54 N | 105 01 10 W |
| Glendive West Sewage Lagoon Dam | Dam | 625 | Dawson | 47 06 54 N | 104 43 44 W |
| Glendora Lake | Lake | 1219 | Teton | 47 52 59 N | 112 14 23 W |
| Glengarry | Locale | 1257 | Fergus | 47 01 42 N | 109 32 55 W |
| Glengarry | Populated Place | 1259 | Fergus | 47 01 37 N | 109 32 53 W |
| Glengarry Mine | Mine | 1914 | Silver Bow | 46 02 15 N | 112 32 45 W |
| Glengarry Mines | Mine | 3000 | Park | 45 04 18 N | 109 57 27 W |
| Glengarry Post Office (historical) | Post Office | 1259 | Fergus | 47 01 37 N | 109 32 53 W |
| Glengarry School (historical) | School | 1259 | Fergus | 47 01 37 N | 109 32 51 W |
| Glenn Creek | Stream | | Lewis and Clark | 47 41 00 N | 112 54 11 W |
| Glennie Ditch | Canal | 1017 | Musselshell | 46 18 39 N | 108 45 52 W |
| Glenns Cabin | Locale | 1834 | Meagher | 46 16 19 N | 110 37 04 W |
| Glenns Falls Mine | Mine | 1674 | Madison | 45 39 37 N | 112 19 45 W |
| Glenns Lake | Lake | 1483 | Glacier | 48 54 12 N | 113 47 33 W |
| Glennwood Ditch | Canal | 1032 | Carbon | 45 33 39 N | 108 49 05 W |
| Glenrock Post Office (historical) | Post Office | 1029 | Carter | 45 55 31 N | 104 25 55 W |
| Glenrock School (historical) | School | 1029 | Carter | 45 55 31 N | 104 25 55 W |
| Glentana | Populated Place | 940 | Valley | 48 50 53 N | 106 14 58 W |
| Glentana (historical) | Locale | 939 | Valley | 48 50 49 N | 106 15 00 W |
| Glentana Elevator (historical) | Locale | 940 | Valley | 48 50 50 N | 106 15 00 W |
| Glentana Post Office | Post Office | 940 | Valley | 48 50 53 N | 106 14 57 W |
| Glentana School (historical) | School | 940 | Valley | 48 50 53 N | 106 14 58 W |
| Glenview School | School | 949 | Blaine | 48 53 15 N | 108 36 55 W |
| Glenwood Lake | Lake | 2498 | Jefferson | 46 17 56 N | 111 53 23 W |
| Gliblet Dam | Dam | 838 | Garfield | 47 12 42 N | 107 00 20 W |
| Glidden Gulch | Valley | | Sanders | 47 34 24 N | 115 38 16 W |
| Glidden Pass | Gap | 1761 | Sanders | 47 32 01 N | 115 42 45 W |
| Glidden Ridge | Ridge | 1848 | Sanders | 47 33 07 N | 115 40 57 W |
| Glidewell Creek | Stream | | Beaverhead | 45 15 23 N | 113 07 44 W |
| Glissade Lake | Lake | 3065 | Carbon | 45 05 46 N | 109 42 53 W |
| Globe Lake | Lake | 2681 | Madison | 45 36 20 N | 112 05 27 W |
| Gloomy Glenn Draw | Valley | | Rosebud | 45 14 26 N | 106 29 15 W |
| Gloria Dei Lutheran Church | Church | 1669 | Silver Bow | 45 59 24 N | 112 30 30 W |
| Gloria Mine | Mine | 1680 | Lincoln | 48 03 45 N | 115 34 31 W |