Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Saint Ignatius Schools | School | 900 | Lake | 47 19 08 N | 114 05 28 W |
| Saint Isadore Church | Church | 974 | Rosebud | 46 37 05 N | 107 33 10 W |
| Saint James Catholic Church | Church | 755 | Sanders | 47 27 37 N | 114 52 58 W |
| Saint James Community Hospital Transitional Care Unit | Hospital | 1728 | Silver Bow | 46 00 32 N | 112 32 43 W |
| Saint James Episcopal Church | Church | 1555 | Beaverhead | 45 12 59 N | 112 38 15 W |
| Saint James Episcopal Church | Church | 1200 | Fergus | 47 03 58 N | 109 25 55 W |
| Saint James Episcopal Church | Church | 1470 | Gallatin | 45 40 40 N | 111 02 14 W |
| Saint James Episcopal Church | Church | 1381 | Powell | 46 24 01 N | 112 44 02 W |
| Saint James Hospital | Hospital | 1728 | Silver Bow | 46 00 32 N | 112 32 43 W |
| Saint James Lutheran Church | Church | 1097 | Stillwater | 45 38 20 N | 109 15 27 W |
| Saint Jane Frances Church | Church | 1032 | Chouteau | 47 35 01 N | 110 47 25 W |
| Saint Joan of Arc Church | Church | 1047 | Carter | 45 53 13 N | 104 32 47 W |
| Saint Joe Creek | Stream | | Madison | 45 25 36 N | 111 39 20 W |
| Saint John Cemetery | Cemetery | 934 | Fallon | 46 21 23 N | 104 16 58 W |
| Saint John Church | Church | 861 | Hill | 48 47 58 N | 110 00 21 W |
| Saint John Congregation | Church | 709 | Sheridan | 48 48 35 N | 104 14 32 W |
| Saint John Episcopal Church | Church | 1175 | Broadwater | 46 19 27 N | 111 31 09 W |
| Saint John Lutheran Church | Church | 641 | Lincoln | 48 23 10 N | 115 33 13 W |
| Saint John Mine | Mine | 1937 | Madison | 45 14 60 N | 111 55 03 W |
| Saint John Mission | Church | 1298 | Jefferson | 46 27 50 N | 111 59 11 W |
| Saint John the Baptist Catholic Church | Church | 928 | Missoula | 47 00 54 N | 114 13 47 W |
| Saint John the Baptist Church | Church | 792 | Garfield | 47 19 11 N | 106 54 39 W |
| Saint John the Baptist Church (historical) | Church | 722 | Prairie | 46 40 31 N | 104 57 26 W |
| Saint John's Catholic Church | Church | 1666 | Silver Bow | 45 59 34 N | 112 31 03 W |
| Saint John's Episcopal Church | Church | 1752 | Silver Bow | 46 00 48 N | 112 32 27 W |
| Saint Johns | Populated Place | 860 | Hill | 48 47 57 N | 110 00 26 W |
| Saint Johns Catholic Cemetery | Cemetery | 871 | Hill | 48 48 48 N | 110 00 27 W |
| Saint Johns Catholic Church | Church | 1139 | Carbon | 45 29 07 N | 108 58 14 W |
| Saint Johns Catholic Church | Church | 915 | Fallon | 46 21 27 N | 104 16 44 W |
| Saint Johns Catholic Church | Church | 1621 | Meagher | 46 16 21 N | 110 48 10 W |
| Saint Johns Catholic Church | Church | 2308 | Park | 45 00 60 N | 109 56 03 W |
| Saint Johns Catholic Church | Church | 708 | Phillips | 48 45 34 N | 107 37 39 W |
| Saint Johns Catholic Church | Church | 1214 | Teton | 47 36 53 N | 111 58 49 W |
| Saint Johns Cemetery | Cemetery | 709 | Sheridan | 48 48 35 N | 104 14 32 W |
| Saint Johns Church | Church | 1490 | Park | 45 22 07 N | 110 44 10 W |
| Saint Johns Church | Church | 1015 | Yellowstone | 45 40 40 N | 108 46 38 W |
| Saint Johns Coulee | Valley | | Blaine | 48 15 39 N | 108 51 25 W |
| Saint Johns Creek | Stream | | Cascade | 47 24 11 N | 111 49 40 W |
| Saint Johns Episcopal Church (historical) | Church | 1684 | Madison | 45 39 31 N | 111 53 40 W |
| Saint Johns Evangelical Lutheran Church | Church | 796 | Garfield | 47 19 21 N | 106 54 34 W |
| Saint Johns Evangelical Lutheran Church (historical) | Church | 813 | Wibaux | 46 59 20 N | 104 11 19 W |
| Saint Johns Fishing Access Site | Locale | 904 | Mineral | 47 00 47 N | 114 32 29 W |
| Saint Johns Fork | Stream | | Rosebud | 45 24 08 N | 106 37 05 W |
| Saint Johns Lutheran Church | Church | 939 | Big Horn | 45 27 39 N | 107 43 08 W |
| Saint Johns Lutheran Church | Church | 1177 | Carbon | 45 08 31 N | 109 00 20 W |
| Saint Johns Lutheran Church | Church | 1065 | Cascade | 47 29 40 N | 111 13 11 W |
| Saint Johns Lutheran Church | Church | 1223 | Lewis and Clark | 46 35 48 N | 112 01 38 W |
| Saint Johns Lutheran Church | Church | 1384 | Powell | 46 23 55 N | 112 43 57 W |
| Saint Johns Lutheran Church | Church | 607 | Roosevelt | 48 06 45 N | 105 11 52 W |
| Saint Johns Lutheran Church (historical) | Church | 1249 | Judith Basin | 47 00 02 N | 109 52 30 W |
| Saint Johns Lutheran Church Missouri Synod (historical) | Church | 583 | Richland | 47 51 20 N | 104 02 42 W |
| Saint Johns Lutheran Hospital | Hospital | 632 | Lincoln | 48 23 30 N | 115 32 54 W |
| Saint Johns Spring | Spring | 1107 | Rosebud | 45 25 10 N | 106 39 24 W |
| Saint Joseph Catholic Church | Church | 636 | Lincoln | 48 23 17 N | 115 32 57 W |
| Saint Joseph Cemetery | Cemetery | 1008 | Ravalli | 46 37 46 N | 114 05 13 W |
| Saint Joseph Cemetery | Cemetery | 627 | Valley | 48 03 22 N | 106 02 31 W |
| Saint Joseph Church | Church | 885 | Big Horn | 45 44 10 N | 107 36 28 W |
| Saint Joseph Church | Church | 1013 | Cascade | 47 30 20 N | 111 19 14 W |
| Saint Joseph Church | Church | 1200 | Missoula | 47 04 29 N | 113 23 08 W |
| Saint Joseph Church | Church | 1245 | Phillips | 47 55 02 N | 108 31 42 W |
| Saint Joseph Convalescent and Retirement Center | Hospital | 910 | Lake | 47 40 55 N | 114 09 51 W |
| Saint Joseph Hospital | Hospital | 909 | Lake | 47 40 56 N | 114 09 46 W |
| Saint Joseph Mission | Church | 895 | Lake | 47 26 19 N | 114 10 20 W |
| Saint Joseph Mission | Church | 996 | Ravalli | 46 37 44 N | 114 04 57 W |
| Saint Joseph Orphan Home | Building | 1172 | Lewis and Clark | 46 37 05 N | 112 01 12 W |
| Saint Joseph Parish | Church | 1559 | Madison | 45 27 20 N | 112 11 49 W |
| Saint Joseph Peak | Summit | 2922 | Ravalli | 46 36 06 N | 114 15 17 W |
| Saint Joseph Post Office (historical) | Post Office | 830 | Hill | 48 47 35 N | 109 40 53 W |
| Saint Joseph School (historical) | School | 830 | Hill | 48 47 35 N | 109 40 53 W |
| Saint Joseph School (historical) | School | 890 | Lake | 47 18 49 N | 114 06 13 W |
| Saint Joseph the Carpenter Church | Church | 896 | Flathead | 48 11 14 N | 114 19 02 W |
| Saint Joseph's Catholic Church | Church | 1685 | Silver Bow | 46 00 14 N | 112 31 42 W |
| Saint Josephs Catholic Church | Church | 1080 | Carbon | 45 23 39 N | 108 54 35 W |
| Saint Josephs Catholic Church | Church | 1051 | Golden Valley | 46 17 41 N | 108 56 17 W |
| Saint Josephs Catholic Church | Church | 625 | Sheridan | 48 46 36 N | 104 33 30 W |
| Saint Josephs Catholic Church | Church | 1256 | Sweet Grass | 45 49 42 N | 109 56 53 W |
| Saint Josephs Catholic Church | Church | 1166 | Teton | 47 48 53 N | 112 11 09 W |
| Saint Josephs Catholic Church | Church | 811 | Treasure | 46 17 34 N | 107 14 03 W |
| Saint Josephs Catholic Church | Church | 625 | Valley | 48 03 28 N | 106 03 00 W |
| Saint Josephs Catholic Church | Church | 1289 | Wheatland | 46 26 15 N | 109 50 09 W |
| Saint Josephs Catholic Church (historical) | Church | 1142 | Stillwater | 45 42 34 N | 109 32 32 W |
| Saint Josephs Church | Church | 1214 | Broadwater | 46 24 27 N | 111 26 43 W |
| Saint Josephs Elementary School | School | 977 | Missoula | 46 52 32 N | 113 59 53 W |
| Saint Josephs Hospital (historical) | Hospital | 1392 | Powell | 46 23 45 N | 112 43 48 W |
| Saint Jude Catholic Church | Church | 1384 | Lewis and Clark | 46 57 18 N | 112 40 54 W |
| Saint Jude Thaddeus Catholic Church | Church | 759 | Hill | 48 32 59 N | 109 40 26 W |
| Saint Jude Thaddeus School | School | 760 | Hill | 48 32 57 N | 109 40 26 W |
| Saint Julian Mine | Mine | 2651 | Park | 45 15 10 N | 110 38 59 W |
| Saint Julian Mine | Mine | 2704 | Park | 45 15 06 N | 110 38 58 W |
| Saint Labre Mission | Church | 888 | Rosebud | 45 36 25 N | 106 16 52 W |
| Saint Labre Mission Airport | Airport | 887 | Rosebud | 45 36 00 N | 106 16 04 W |
| Saint Labre School | School | 888 | Rosebud | 45 36 21 N | 106 16 56 W |
| Saint Lawrence Creek | Stream | | Missoula | 46 53 28 N | 113 46 57 W |
| Saint Lawrence Mine | Mine | 2005 | Madison | 45 16 31 N | 112 00 05 W |
| Saint Lawrence Mine | Mine | 1932 | Madison | 45 16 35 N | 112 00 53 W |
| Saint Lawrence O'Toole Church | Church | 1890 | Silver Bow | 46 01 38 N | 112 32 05 W |
| Saint Lawrences Episcopal Church (historical) | Church | 594 | Richland | 47 43 00 N | 104 09 23 W |
| Saint Leonards Church | Church | 769 | Sanders | 47 18 59 N | 114 19 18 W |
| Saint Leos Catholic Church | Church | 1196 | Fergus | 47 04 01 N | 109 25 33 W |
| Saint Louis Catholic Church | Church | 849 | Daniels | 48 48 19 N | 105 10 35 W |
| Saint Louis Creek | Stream | | Missoula | 47 14 04 N | 114 42 01 W |
| Saint Louis Gulch | Valley | | Beaverhead | 45 29 36 N | 113 06 21 W |
| Saint Louis Gulch | Valley | | Lewis and Clark | 46 39 30 N | 112 11 41 W |
| Saint Louis Mine | Mine | 2015 | Broadwater | 46 20 19 N | 111 41 58 W |
| Saint Luke Community Hospital | Hospital | 931 | Lake | 47 31 42 N | 114 06 25 W |
| Saint Luke Community Nursing Home | Hospital | 931 | Lake | 47 31 42 N | 114 06 25 W |
| Saint Luke the Evangelist Catholic Church | Church | 1025 | Cascade | 47 31 33 N | 111 18 20 W |
| Saint Lukes English Lutheran Church (historical) | Church | 1746 | Carbon | 45 09 60 N | 109 14 58 W |
| Saint Lukes Episcopal Church | Church | 644 | Lincoln | 48 22 55 N | 115 33 14 W |
| Saint Lukes Episcopal Church (historical) | Church | 1070 | Cascade | 47 23 22 N | 110 55 38 W |