| NUMBER | NAME | COUNTY | LAT | LON |
| MT05 | Archers Island | Chouteau | 475639N | 1102613W |
| MT05 | Baker Bar | Chouteau | 475020N | 1103711W |
| MT02 | Beaver Island | Richland | 472605N | 1042010W |
| MT02 | Big Island | Sheridan | 482650N | 1042258W |
| MT04 | Big Marys Island | Yellowstone | 460023N | 1075545W |
| MT07 | Bird Island | Lake | 474759N | 1140442W |
| MT05 | Boggs Island | Chouteau | 480048N | 1101623W |
| MT02 | Breakneck Island | Richland | 472647N | 1041839W |
| MT02 | Bruces Island | Sheridan | 482826N | 1042703W |
| MT05 | Brule Bar | Chouteau | 475244N | 1103007W |
| MT05 | Buckshot Island | Cascade | 472553N | 1112117W |
| MT02 | Buella Island | Richland | 473623N | 1041140W |
| MT07 | Bull Island | Lake | 474614N | 1140655W |
| MT07 | Callows Island | Lincoln | 481518N | 1155105W |
| MT07 | Cedar Island | Lincoln | 483807N | 1151744W |
| MT07 | Cedar Island | Lake | 475345N | 1140955W |
| MT02 | Chelsea Island | Roosevelt | 480652N | 1052005W |
| MT04 | Cherry Island | Yellowstone | 454900N | 1082651W |
| MT01 | Chrome Island | Wibaux | 472043N | 1042438W |
| MT07 | Clayton Island | Flathead | 481423N | 1135007W |
| MT05 | Council Island | Chouteau | 474405N | 1093642W |
| MT03 | Cow Island | Blaine | 474620N | 1085649W |
| MT02 | Crittenden Island | Richland | 472915N | 1041700W |
| MT07 | Cromwell Island | Lake | 475101N | 1141546W |
| MT05 | Crow Coulee Bar | Chouteau | 475914N | 1101944W |
| MT07 | Deer Island | Flathead | 480704N | 1140156W |
| MT02 | Devils Island | Richland | 472628N | 1042000W |
| MT02 | Diamond Island | Richland | 473537N | 1041255W |
| MT07 | Douglas Islands | Lake | 475601N | 1141003W |
| MT04 | Dovers Island | Yellowstone | 455124N | 1082329W |
| MT07 | Dream Island | Lake | 474843N | 1141347W |
| MT02 | Duck Island | Richland | 472456N | 1042033W |
| MT02 | Duck Island | Valley | 480259N | 1062450W |
| MT07 | Elk Island | Flathead | 481425N | 1134750W |
| MT02 | Elk Island | Richland | 472813N | 1041820W |
| MT02 | Elms Island | Richland | 472413N | 1042105W |
| MT05 | Evans Bend | Chouteau | 475108N | 1103425W |
| MT04 | Far West Island | Big Horn | 453804N | 1074000W |
| MT04 | Fire Island | Sweet Grass | 454916N | 1095655W |
| MT07 | Fire Island | Flathead | 481743N | 1135346W |
| MT07 | Firemens Island | Flathead | 480805N | 1140320W |
| MT05 | Fisher Island | Cascade | 472435N | 1111822W |
| MT07 | Goose Island | Lake | 475655N | 1141037W |
| MT04 | Government Island | Yellowstone | 460925N | 1072839W |
| MT03 | Grand Island | Phillips | 474151N | 1084806W |
| MT02 | Gros Ventre Island | Richland | 472238N | 1042341W |
| MT02 | Gull Island | Sheridan | 482731N | 1042329W |
| MT03 | Holmes Council Islands | Fergus | 474438N | 1093312W |
| MT04 | Howery Island | Treasure | 461450N | 1072200W |
| MT02 | Idiom Island | Richland | 472147N | 1042357W |
| MT03 | Iron City Islands | Fergus | 474444N | 1093111W |
| MT07 | Island, The | Flathead | 482610N | 1142247W |
| MT01 | Island, The | Carter | 452310N | 1040404W |
| MT02 | Joes Island | Dawson | 471608N | 1043152W |
| MT03 | Jones Island | Phillips | 473725N | 1083547W |
| MT07 | Kelly Island | Missoula | 465150N | 1140624W |
| MT07 | Kelly Island | Flathead | 481555N | 1134915W |
| MT03 | King Island | Fergus | 473708N | 1083848W |
| MT07 | Little Bull Island | Lake | 474605N | 1140727W |
| MT06 | Livingston Island | Park | 453938N | 1103240W |
| MT03 | Long Island | Phillips | 482523N | 1074144W |
| MT07 | Lost Island | Flathead | 481208N | 1134555W |
| MT06 | Lovell Island | Beaverhead | 451202N | 1124049W |
| MT03 | Lower Two Calf Island | Phillips | 473845N | 1084543W |
| MT07 | Mary B Island | Lake | 475531N | 1141005W |
| MT02 | Marys Island | Richland | 472309N | 1042208W |
| MT07 | Melita Island | Lake | 474917N | 1141405W |
| MT02 | Monroe Island | Dawson | 465820N | 1044720W |
| MT05 | Nelson Island | Cascade | 472038N | 1113510W |
| MT05 | Pablo Island | Chouteau | 474543N | 1095449W |
| MT05 | Park Island | Cascade | 472901N | 1111850W |
| MT03 | Pelican Islands | Phillips | 482442N | 1074036W |
| MT01 | Pirogue Island | Custer | 462626N | 1054900W |
| MT07 | Pleasant Island | Flathead | 480959N | 1142119W |
| MT03 | PN Island | Fergus | 474412N | 1093814W |
| MT04 | Randalls Island | Yellowstone | 460200N | 1075107W |
| MT07 | Rock Island | Lake | 475341N | 1141014W |
| MT07 | Rock Island | Sanders | 475626N | 1154240W |
| MT05 | Roosevelt Island | Chouteau | 474816N | 1104120W |
| MT05 | Sacajawea Island | Cascade | 473107N | 1111815W |
| MT02 | Schaffer Island | Dawson | 471355N | 1043745W |
| MT07 | Scott Island | Lincoln | 482848N | 1155347W |
| MT02 | Scout Island | Valley | 480202N | 1062528W |
| MT02 | Seven Sisters Island | Richland | 473342N | 1041438W |
| MT07 | Shelter Island | Lake | 475344N | 1141024W |
| MT05 | Shonkin Bar | Chouteau | 475042N | 1103601W |
| MT06 | Siebeck Island | Park | 453828N | 1103348W |
| MT02 | Skinners Island | Roosevelt | 480532N | 1050654W |
| MT06 | Smith Island | Beaverhead | 451220N | 1124038W |
| MT02 | Snake Island | Richland | 472110N | 1042440W |
| MT07 | Sourdough Island | Missoula | 470615N | 1132436W |
| MT04 | Spraklin Island | Yellowstone | 455513N | 1081828W |
| MT07 | Steamboat Island | Sanders | 473502N | 1151936W |
| MT05 | Steamboat Island | Cascade | 473147N | 1111424W |
| MT03 | Sturgeon Island | Blaine | 474756N | 1090459W |
| MT05 | Taylor Island | Cascade | 472807N | 1111858W |
| MT05 | Three Islands | Chouteau | 475812N | 1102206W |
| MT05 | Thunderbird Island | Glacier | 484723N | 1132448W |
| MT03 | Upper Two Calf Island | Phillips | 473923N | 1084655W |
| MT04 | Westover Island | Carbon | 453505N | 1090437W |
| MT05 | White Bear Islands | Cascade | 472733N | 1111820W |
| MT02 | White Shield Island | Roosevelt | 480503N | 1050337W |
| MT05 | Wild Goose Island | Glacier | 484120N | 1133220W |
| MT07 | Wild Horse Island | Lake | 475043N | 1141251W |
| MT05 | Wolf Island | Chouteau | 474423N | 1095237W |
| MT03 | Woody Island | Phillips | 482418N | 1074055W |
| MT07 | Yarnell Island | Lincoln | 482730N | 1151742W |
| MT02 | York Island | Garfield | 475548N | 1062756W |
| MT02 | Youngs Island | Sheridan | 482749N | 1042645W |
