Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Sagebrush Gulch | Valley | | Broadwater | 46 17 17 N | 111 42 34 W |
| Sagebrush Number 2 Dam | Dam | 875 | Phillips | 47 42 24 N | 108 25 14 W |
| Sagebrush Number 3 Dam | Dam | 878 | Fergus | 47 31 48 N | 108 40 39 W |
| Sagebrush Park | Flat | 1783 | Jefferson | 46 11 41 N | 111 51 45 W |
| Sagebrush Point | Cape | 1756 | Gallatin | 45 23 06 N | 111 11 34 W |
| Sagebrush Reservoir | Reservoir | 873 | Phillips | 47 42 23 N | 108 25 17 W |
| Sagedale Post Office (historical) | Post Office | 862 | Rosebud | 46 48 37 N | 107 40 56 W |
| Saginaw Creek | Stream | | Beaverhead | 45 15 42 N | 113 26 09 W |
| Saginaw Mine | Mine | 2227 | Beaverhead | 45 13 47 N | 113 26 53 W |
| Saginaw Mine | Mine | 2244 | Beaverhead | 45 13 38 N | 113 25 55 W |
| Sagittaurius Dam | Dam | 964 | Toole | 48 29 42 N | 111 32 27 W |
| Sahara (historical) | Populated Place | 1717 | Golden Valley | 46 44 40 N | 109 08 50 W |
| Sahara Coulee | Valley | | Hill | 48 54 10 N | 110 25 33 W |
| Sahara Hill | Summit | 1622 | Golden Valley | 46 40 39 N | 109 05 08 W |
| Sahara Post Office (historical) | Post Office | 1717 | Golden Valley | 46 44 40 N | 109 08 50 W |
| Sahara Post Office (historical) | Post Office | 1206 | Musselshell | 46 38 47 N | 108 55 46 W |
| Sailor Lake | Lake | 2702 | Madison | 45 36 10 N | 112 05 47 W |
| Sailor Lake Mine | Mine | 2662 | Madison | 45 36 08 N | 112 05 28 W |
| Saint Agnes Catholic Church | Church | 1698 | Carbon | 45 11 14 N | 109 14 60 W |
| Saint Agnes School (historical) | School | 1699 | Carbon | 45 11 14 N | 109 15 01 W |
| Saint Alberts Catholic Church | Church | 931 | Mineral | 47 00 06 N | 114 28 24 W |
| Saint Alberts Catholic Church | Church | 661 | Valley | 48 23 44 N | 107 05 15 W |
| Saint Alberts Hall | Building | 1230 | Lewis and Clark | 46 36 03 N | 112 02 15 W |
| Saint Aloysius Church | Church | 902 | Petroleum | 47 00 14 N | 108 21 15 W |
| Saint Andrew Episcopal Church | Church | 894 | Lake | 47 41 24 N | 114 09 38 W |
| Saint Andrews Anglican Catholic Church | Church | 1258 | Lewis and Clark | 46 35 10 N | 112 01 33 W |
| Saint Andrews Episcopal Church | Church | 908 | Flathead | 48 03 48 N | 114 04 21 W |
| Saint Andrews Episcopal Church | Church | 1624 | Granite | 46 20 03 N | 113 17 36 W |
| Saint Andrews Episcopal Church | Church | 1372 | Park | 45 39 34 N | 110 33 43 W |
| Saint Andrews Episcopal Church (historical) | Church | 1821 | Meagher | 46 26 29 N | 110 40 19 W |
| Saint Ann Church | Church | 943 | Carter | 45 51 10 N | 104 12 59 W |
| Saint Ann's Catholic Church | Church | 1676 | Silver Bow | 45 59 36 N | 112 30 08 W |
| Saint Anne Cemetery | Cemetery | 1366 | Pondera | 48 16 58 N | 112 50 15 W |
| Saint Anne Parish | Church | 1369 | Pondera | 48 16 55 N | 112 50 11 W |
| Saint Annes Catholic Church | Church | 891 | Flathead | 48 04 46 N | 114 13 17 W |
| Saint Anns Cathedral | Church | 1020 | Cascade | 47 30 32 N | 111 17 43 W |
| Saint Anns Catholic Church | Church | 1068 | Cascade | 47 30 20 N | 111 48 37 W |
| Saint Anns Catholic Church | Church | 871 | Daniels | 48 47 02 N | 105 49 50 W |
| Saint Anns Catholic Church | Church | 1010 | Missoula | 46 52 24 N | 113 51 52 W |
| Saint Anns Cemetery | Cemetery | 1189 | Lewis and Clark | 46 35 12 N | 111 54 08 W |
| Saint Anns Cemetery | Cemetery | 607 | Roosevelt | 48 08 19 N | 105 15 34 W |
| Saint Anns Chapel | Church | 602 | Roosevelt | 48 07 55 N | 105 18 01 W |
| Saint Anns Church | Church | 729 | McCone | 47 50 06 N | 105 29 31 W |
| Saint Anthony and Dakota Elevator (historical) | Locale | 823 | Chouteau | 48 10 43 N | 110 06 44 W |
| Saint Anthony and Dakota Elevator (historical) | Locale | 863 | Hill | 48 34 10 N | 110 17 59 W |
| Saint Anthony and Dakota Elevator (historical) | Locale | 648 | Valley | 48 21 16 N | 106 54 34 W |
| Saint Anthony and Dakota Elevator (historical) | Locale | 665 | Valley | 48 23 34 N | 107 05 11 W |
| Saint Anthony Cemetery | Cemetery | 852 | Fallon | 46 24 15 N | 104 31 14 W |
| Saint Anthony Church | Church | 1097 | Fergus | 47 19 11 N | 109 56 51 W |
| Saint Anthony Church | Church | 816 | Hill | 48 19 02 N | 110 00 48 W |
| Saint Anthony Elevator (historical) | Locale | 872 | Hill | 48 34 11 N | 110 05 12 W |
| Saint Anthony Mine | Mine | 1839 | Jefferson | 46 02 34 N | 112 12 59 W |
| Saint Anthony Mine | Mine | 637 | Lincoln | 48 25 45 N | 115 36 53 W |
| Saint Anthony Parish | Church | 977 | Missoula | 46 51 43 N | 114 00 05 W |
| Saint Anthony Station | Church | 592 | Roosevelt | 48 08 48 N | 104 42 57 W |
| Saint Anthonys Catholic Church | Church | 857 | Fallon | 46 25 05 N | 104 31 09 W |
| Saint Anthonys Catholic Church | Church | 591 | Roosevelt | 48 08 51 N | 104 31 23 W |
| Saint Anthonys Church | Church | 1012 | Yellowstone | 45 40 34 N | 108 46 32 W |
| Saint Barbaras Catholic Church | Church | 1063 | Fergus | 47 01 27 N | 108 48 14 W |
| Saint Bartholomews Catholic Church | Church | 1551 | Meagher | 46 32 40 N | 110 54 05 W |
| Saint Bernards Church | Church | 681 | Richland | 48 02 28 N | 104 50 14 W |
| Saint Bernards Church Cemetery | Cemetery | 679 | Richland | 48 02 27 N | 104 50 20 W |
| Saint Boniface Catholic Church | Church | 721 | Sheridan | 48 53 26 N | 104 46 36 W |
| Saint Catherine Catholic Church | Church | 1494 | Jefferson | 46 13 60 N | 112 06 55 W |
| Saint Catherine Catholic Church | Church | 584 | Richland | 47 51 00 N | 104 02 51 W |
| Saint Catherines Catholic Church | Church | 908 | Flathead | 48 03 48 N | 114 04 21 W |
| Saint Charles (historical) | Locale | 1598 | Meagher | 46 21 57 N | 110 49 42 W |
| Saint Charles Borromea Church | Church | 923 | Flathead | 48 24 35 N | 114 20 18 W |
| Saint Charles Borromeo Church | Church | 1240 | Big Horn | 45 25 47 N | 108 31 59 W |
| Saint Charles Chapel | Church | 1233 | Lewis and Clark | 46 36 03 N | 112 02 19 W |
| Saint Charles Hall | Building | 1233 | Lewis and Clark | 46 36 03 N | 112 02 19 W |
| Saint Charles Mission School | School | 1255 | Big Horn | 45 24 52 N | 108 33 17 W |
| Saint Christophers Episcopal Church (historical) | Church | 1005 | Toole | 48 30 19 N | 111 51 25 W |
| Saint Clair (historical) | Populated Place | 1020 | Cascade | 47 16 51 N | 111 40 53 W |
| Saint Clair Creek | Stream | | Ravalli | 46 12 08 N | 114 00 49 W |
| Saint Clair Creek Bridge | Bridge | 785 | Lincoln | 48 52 41 N | 115 03 08 W |
| Saint Clair Methodist Church (historical) | Church | 1020 | Cascade | 47 16 51 N | 111 40 53 W |
| Saint Clair Peak | Summit | 2198 | Lincoln | 48 55 49 N | 114 53 53 W |
| Saint Clair Post Office (historical) | Post Office | 1020 | Cascade | 47 16 51 N | 111 40 53 W |
| Saint Clair School (historical) | School | 1023 | Cascade | 47 15 45 N | 111 41 38 W |
| Saint Clement Church | Church | 1392 | Cascade | 47 05 54 N | 110 50 19 W |
| Saint Cyril and Methodius Catholic Church (historical) | Church | 1098 | Cascade | 47 21 24 N | 111 09 55 W |
| Saint Cyril Church | Church | 1277 | Judith Basin | 47 15 33 N | 110 29 36 W |
| Saint Dennis Parish | Church | 926 | Big Horn | 45 36 06 N | 107 27 40 W |
| Saint Elizabeth Catholic Church | Church | 647 | Sheridan | 48 52 05 N | 104 03 03 W |
| Saint Frances De Sales Catholic Church | Church | 776 | Dawson | 47 38 28 N | 105 04 08 W |
| Saint Francis Assisi Church | Church | 665 | Phillips | 48 27 36 N | 107 20 31 W |
| Saint Francis Catholic Church | Church | 1163 | Pondera | 48 18 23 N | 112 15 16 W |
| Saint Francis Catholic Church | Church | 1088 | Ravalli | 46 14 35 N | 114 09 41 W |
| Saint Francis Church | Church | 1167 | Big Horn | 45 21 06 N | 106 58 59 W |
| Saint Francis Episcopal Church | Church | 1057 | Cascade | 47 30 13 N | 111 13 48 W |
| Saint Francis Upper School | School | 954 | Yellowstone | 45 46 53 N | 108 30 41 W |
| Saint Francis Xavier Catholic Church | Church | 934 | Big Horn | 45 27 48 N | 107 43 40 W |
| Saint Francis Xavier Church | Church | 978 | Missoula | 46 52 29 N | 113 59 51 W |
| Saint Francis Xavier Church (historical) | Church | 1182 | Cascade | 47 16 13 N | 111 16 23 W |
| Saint Francis Xaviers Catholic Church | Church | 746 | McCone | 47 24 58 N | 105 35 28 W |
| Saint Gabriel Cemetery | Cemetery | 739 | Blaine | 48 36 23 N | 109 15 08 W |
| Saint Gabriels Catholic Church | Church | 734 | Blaine | 48 35 20 N | 109 14 13 W |
| Saint Gerards Church | Church | 1039 | Cascade | 47 30 37 N | 111 16 05 W |
| Saint Ignatius | Populated Place | 896 | Lake | 47 19 12 N | 114 05 38 W |
| Saint Ignatius Airport | Airport | 910 | Lake | 47 19 29 N | 114 04 53 W |
| Saint Ignatius Camping | Locale | 890 | Lake | 47 19 38 N | 114 05 46 W |
| Saint Ignatius Cemetery | Cemetery | 901 | Lake | 47 18 39 N | 114 05 36 W |
| Saint Ignatius Christian Church | Church | 896 | Lake | 47 19 12 N | 114 05 38 W |
| Saint Ignatius Mission (historical) | Locale | 887 | Lake | 47 18 54 N | 114 06 11 W |
| Saint Ignatius Mission Church | Church | 888 | Lake | 47 18 53 N | 114 06 11 W |
| Saint Ignatius Old Catholic Cemetery | Cemetery | 888 | Lake | 47 18 53 N | 114 06 11 W |
| Saint Ignatius Police Department | Building | 896 | Lake | 47 19 12 N | 114 05 38 W |
| Saint Ignatius Post Office | Post Office | 897 | Lake | 47 19 10 N | 114 05 39 W |
| Saint Ignatius Public Library | Building | 896 | Lake | 47 19 12 N | 114 05 38 W |