Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Grayling Creek | Stream | | Gallatin | 44 46 60 N | 111 07 34 W |
| Grayling Lake | Lake | 2651 | Beaverhead | 45 34 45 N | 112 59 06 W |
| Grayling Lake | Lake | 2541 | Gallatin | 45 24 03 N | 111 20 03 W |
| Grayling Lake Number One | Lake | 911 | Flathead | 48 09 01 N | 114 04 03 W |
| Grayling Lake Number Two | Lake | 905 | Flathead | 48 09 34 N | 114 04 19 W |
| Grayling Post Office (historical) | Post Office | 2014 | Gallatin | 44 48 20 N | 111 11 38 W |
| Grayling School (historical) | School | 1643 | Beaverhead | 45 02 48 N | 112 49 15 W |
| Grays Fork | Stream | | Beaverhead | 44 46 13 N | 112 15 27 W |
| Grays Golf Course Ski Trail | Trail | 1454 | Flathead | 48 29 06 N | 114 21 13 W |
| Grays Gulch | Valley | | Deer Lodge | 46 07 50 N | 113 00 42 W |
| Grays Gulch | Valley | | Sanders | 47 45 34 N | 115 36 40 W |
| Grays Point | Cape | 690 | Phillips | 47 38 06 N | 108 42 08 W |
| Grazing Antelope Dam | Dam | 1384 | Wheatland | 46 32 60 N | 109 46 15 W |
| Greasewood Bottom | Bend | 726 | Blaine | 47 47 45 N | 109 15 57 W |
| Greasewood Creek | Stream | | Carter | 46 01 33 N | 104 24 49 W |
| Greasewood Creek | Stream | | Glacier | 48 40 02 N | 112 56 28 W |
| Greasewood Creek | Stream | | Rosebud | 46 17 22 N | 106 48 48 W |
| Greasewood Flat | Flat | 1335 | Glacier | 48 38 59 N | 113 01 38 W |
| Greasy Grass Ridge | Ridge | 982 | Big Horn | 45 33 32 N | 107 25 24 W |
| Greasy Hill | Summit | 1238 | Carter | 45 13 47 N | 104 48 11 W |
| Great Bear Creek | Stream | | Flathead | 48 27 40 N | 113 49 42 W |
| Great Bear Mountain | Summit | 2310 | Flathead | 48 24 41 N | 113 52 45 W |
| Great Bear Wilderness | Reserve | 1853 | Flathead | 48 10 60 N | 113 35 03 W |
| Great Beginnings Montessori School | School | 1537 | Gallatin | 45 38 05 N | 111 02 28 W |
| Great Divide | Locale | 1816 | Lewis and Clark | 46 45 12 N | 112 18 50 W |
| Great Divide Cemetery | Cemetery | 1399 | Fergus | 46 59 51 N | 109 12 16 W |
| Great Divide Educational Services Cooperative | School | 1392 | Powell | 46 23 43 N | 112 43 48 W |
| Great Divide School (historical) | School | 1401 | Fergus | 46 59 58 N | 109 12 15 W |
| Great Falls | Locale | 1014 | Cascade | 47 29 52 N | 111 18 23 W |
| Great Falls | Populated Place | 1015 | Cascade | 47 30 01 N | 111 18 03 W |
| Great Falls Christian Center | Church | 1040 | Cascade | 47 31 17 N | 111 13 58 W |
| Great Falls Christian Church | Church | 1032 | Cascade | 47 30 57 N | 111 16 26 W |
| Great Falls Clinic | Hospital | 1062 | Cascade | 47 29 17 N | 111 15 28 W |
| Great Falls Creek | Stream | | Sweet Grass | 45 28 36 N | 110 12 33 W |
| Great Falls Eye Surgery Center | Hospital | 1047 | Cascade | 47 29 10 N | 111 18 03 W |
| Great Falls Fire Department | Building | 1019 | Cascade | 47 30 15 N | 111 17 31 W |
| Great Falls Genealogy Society Library | Building | 1029 | Cascade | 47 30 21 N | 111 16 56 W |
| Great Falls High School | School | 1039 | Cascade | 47 30 07 N | 111 16 26 W |
| Great Falls International Airport | Airport | 1117 | Cascade | 47 28 55 N | 111 22 17 W |
| Great Falls KOA Campground | Locale | 1063 | Cascade | 47 29 36 N | 111 13 23 W |
| Great Falls Police Department | Building | 1014 | Cascade | 47 30 14 N | 111 18 28 W |
| Great Falls Post Office | Post Office | 1014 | Cascade | 47 30 25 N | 111 18 13 W |
| Great Falls Public Library | Building | 1015 | Cascade | 47 30 28 N | 111 18 08 W |
| Great Falls Rescue Mission | Church | 1015 | Cascade | 47 30 10 N | 111 18 04 W |
| Great Northern Crossing (historical) | Locale | 1189 | Lewis and Clark | 46 36 55 N | 112 04 08 W |
| Great Northern Flats | Flat | 996 | Flathead | 48 34 21 N | 114 08 03 W |
| Great Northern Flats use site | Locale | 997 | Flathead | 48 34 04 N | 114 07 50 W |
| Great Northern Hospital (historical) | Hospital | 638 | Valley | 48 11 49 N | 106 38 12 W |
| Great Northern Mine | Mine | 1768 | Lincoln | 48 03 54 N | 115 33 46 W |
| Great Northern Mountain | Summit | 2609 | Flathead | 48 20 09 N | 113 46 37 W |
| Great Northern Mountain | Summit | 2083 | Lincoln | 48 05 03 N | 115 33 59 W |
| Great Northern Railway Historical Marker | Park | 1923 | Beaverhead | 44 37 32 N | 112 34 53 W |
| Great Northern Railway Overpass | Bridge | 1002 | Toole | 48 30 30 N | 111 51 39 W |
| Great Northern Reservoir | Reservoir | 958 | Liberty | 48 31 06 N | 110 57 37 W |
| Great Republic Mine | Mine | 1733 | Silver Bow | 46 01 04 N | 112 35 27 W |
| Great Western Malting Company Elevator | Locale | 1076 | Pondera | 48 02 08 N | 111 50 24 W |
| Great Western Mine | Mine | 2354 | Beaverhead | 45 43 09 N | 112 54 11 W |
| Great Western Mine | Mine | 2048 | Meagher | 46 28 06 N | 110 41 01 W |
| Greathouse Peak | Summit | 2638 | Fergus | 46 46 07 N | 109 21 21 W |
| Grebe Number 1 Dam | Dam | 882 | Rosebud | 46 46 06 N | 107 41 02 W |
| Grebe Ranch | Locale | 909 | Rosebud | 46 44 39 N | 107 40 29 W |
| Greek Creek | Stream | | Gallatin | 45 22 47 N | 111 10 33 W |
| Greek Creek Camp | Locale | 1753 | Gallatin | 45 22 52 N | 111 10 42 W |
| Greek Orthodox Church | Church | 977 | Missoula | 46 51 50 N | 114 00 02 W |
| Greeley Creek | Stream | | Park | 45 41 24 N | 110 16 38 W |
| Greeley Elementary School | School | 1680 | Silver Bow | 46 00 10 N | 112 30 00 W |
| Greeley Elevator (historical) | Locale | 952 | Chouteau | 47 46 52 N | 110 57 23 W |
| Greeley Elevator (historical) | Locale | 1055 | Chouteau | 47 35 52 N | 110 42 49 W |
| Green (historical) | Locale | 737 | Dawson | 47 08 32 N | 104 56 26 W |
| Green Acres | Populated Place | 630 | Lincoln | 48 23 55 N | 115 34 04 W |
| Green Acres Addition (subdivision) | Populated Place | 1372 | Park | 45 39 45 N | 110 33 40 W |
| Green Acres Campground | Locale | 595 | Richland | 47 39 46 N | 104 11 51 W |
| Green Ashley Gulch | Valley | | Golden Valley | 46 39 02 N | 109 15 14 W |
| Green Basin | Basin | 761 | Lincoln | 48 59 07 N | 115 12 19 W |
| Green Bird Mine | Mine | 1369 | Lewis and Clark | 46 42 03 N | 112 09 53 W |
| Green Campbell Mine | Mine | 1703 | Madison | 45 41 42 N | 112 19 50 W |
| Green Canyon | Valley | | Gallatin | 45 56 07 N | 110 48 55 W |
| Green Canyon | Valley | | Gallatin | 45 49 13 N | 110 59 49 W |
| Green Canyon | Valley | | Golden Valley | 46 41 19 N | 109 18 38 W |
| Green Canyon | Valley | | Meagher | 46 29 46 N | 110 23 18 W |
| Green Canyon Creek | Stream | | Gallatin | 45 58 45 N | 110 49 01 W |
| Green Canyon Creek | Stream | | Granite | 46 02 60 N | 113 34 45 W |
| Green Canyon Lake | Lake | 2263 | Granite | 46 03 12 N | 113 38 19 W |
| Green Copper Mine | Mine | 1685 | Silver Bow | 46 00 21 N | 112 31 27 W |
| Green Coulee | Valley | | Garfield | 47 32 21 N | 106 25 18 W |
| Green Coulee | Valley | | McCone | 47 56 15 N | 105 59 33 W |
| Green Coulee | Valley | | Sheridan | 48 31 44 N | 104 40 02 W |
| Green Coulee Dam | Dam | 730 | Garfield | 47 32 36 N | 106 25 20 W |
| Green Creek | Stream | | Chouteau | 48 09 54 N | 109 46 29 W |
| Green Creek | Stream | | Judith Basin | 47 05 12 N | 110 37 51 W |
| Green Creek | Stream | | Lewis and Clark | 47 09 35 N | 112 18 41 W |
| Green Creek | Stream | | Lincoln | 48 52 20 N | 115 56 45 W |
| Green Creek | Stream | | Powder River | 45 41 49 N | 105 53 37 W |
| Green Creek | Stream | | Rosebud | 45 24 11 N | 106 18 12 W |
| Green Creek Reservoir | Reservoir | 1046 | Rosebud | 45 23 26 N | 106 18 30 W |
| Green Creek Spring | Spring | 1062 | Rosebud | 45 23 33 N | 106 19 24 W |
| Green Field Mobile Home Park | Populated Place | 956 | Missoula | 46 53 03 N | 114 05 03 W |
| Green Fork Guard Station | Locale | 1826 | Lewis and Clark | 47 22 03 N | 112 48 38 W |
| Green Fork Straight Creek | Stream | | Lewis and Clark | 47 22 28 N | 112 49 14 W |
| Green Gulch | Valley | | Sanders | 47 41 51 N | 115 37 18 W |
| Green Gulch | Valley | | Teton | 47 51 48 N | 112 45 28 W |
| Green Hollow | Valley | | Gallatin | 45 30 30 N | 111 21 18 W |
| Green Lake | Lake | 2688 | Beaverhead | 45 33 56 N | 112 54 34 W |
| Green Lake | Lake | 2841 | Carbon | 45 01 58 N | 109 39 49 W |
| Green Lake | Lake | 1579 | Glacier | 48 23 18 N | 113 17 18 W |
| Green Lake | Lake | 2388 | Granite | 46 17 10 N | 113 05 01 W |
| Green Lake | Lake | 902 | Lincoln | 48 52 27 N | 115 07 07 W |
| Green Lake | Lake | 2945 | Park | 45 05 60 N | 109 54 07 W |
| Green Lake | Lake | 1952 | Park | 45 09 34 N | 110 53 23 W |
| Green Lake | Lake | 1470 | Pondera | 48 14 36 N | 112 52 01 W |