| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Sage Junction | city | Idaho | United States | 43.83083 | -112.19444 | 4875 | 187 |
| Sagle | city | Idaho | United States | 48.2025 | -116.54667 | 2198 | 1160 |
| Saint Anthony | city | Idaho | United States | 43.96639 | -111.68139 | 4986 | 2047 |
| Saint Charles | city | Idaho | United States | 42.11389 | -111.38806 | 5957 | 224 |
| Saint Joe | city | Idaho | United States | 47.31111 | -116.35194 | 2316 | 399 |
| Saint Johns | city | Idaho | United States | 42.21389 | -112.29111 | 4599 | 140 |
| Saint Maries | city | Idaho | United States | 47.31444 | -116.56167 | 2132 | 465 |
| Salem | city | Idaho | United States | 43.87667 | -111.77222 | 4895 | 3483 |
| Salmon | city | Idaho | United States | 45.17583 | -113.895 | 3966 | 126 |
| Salubria | city | Idaho | United States | 44.56361 | -116.66528 | 2700 | 75 |
| Sam | city | Idaho | United States | 43.71917 | -111.30306 | 6768 | 453 |
| Samaria | city | Idaho | United States | 42.11778 | -112.33611 | 4442 | 140 |
| Sampson | city | Idaho | United States | 45.51778 | -116.0075 | 5997 | 24 |
| Samuels | city | Idaho | United States | 48.42944 | -116.49278 | 2175 | 1099 |
| Sand Hollow | city | Idaho | United States | 43.80778 | -116.74806 | 2486 | 2649 |
| Sanders | city | Idaho | United States | 47.10639 | -116.79528 | 2732 | 398 |
| Sandpoint | city | Idaho | United States | 48.27667 | -116.55222 | 2060 | 5462 |
| Sands historical | city | Idaho | United States | 43.48889 | -116.91389 | 2598 | 1031 |
| Santa | city | Idaho | United States | 47.15028 | -116.44806 | 2798 | 523 |
| Sarilda | city | Idaho | United States | 44.11028 | -111.57306 | 5311 | 40 |
| Sawtooth City | city | Idaho | United States | 43.89667 | -114.83944 | 7401 | 136 |
| Sawyer | city | Idaho | United States | 48.14444 | -116.75472 | 2257 | 721 |
| Schiller | city | Idaho | United States | 42.87972 | -112.6575 | 4406 | 124 |
| Schnoors | city | Idaho | United States | 48.68972 | -116.33861 | 1791 | 295 |
| Schodde | city | Idaho | United States | 42.60722 | -113.99028 | 4186 | 577 |
| Schow | city | Idaho | United States | 42.58694 | -113.71056 | 4153 | 7808 |
| Scoville | city | Idaho | United States | 43.48056 | -112.99528 | 5019 | 60 |
| Seaburg | city | Idaho | United States | 45.47611 | -116.03 | 6030 | 37 |
| Sebree | city | Idaho | United States | 43.18583 | -115.78972 | 3198 | 470 |
| Selby | city | Idaho | United States | 43.34389 | -114.70972 | 4999 | 33 |
| Selle | city | Idaho | United States | 48.35694 | -116.48861 | 2165 | 1062 |
| Seneacquoteen | city | Idaho | United States | 48.15167 | -116.75444 | 2099 | 721 |
| Setters | city | Idaho | United States | 47.46806 | -117.00722 | 2585 | 551 |
| Sharon | city | Idaho | United States | 42.35056 | -111.47833 | 6207 | 221 |
| Shelley | city | Idaho | United States | 43.38139 | -112.1225 | 4629 | 6037 |
| Shells Lick | city | Idaho | United States | 45.70667 | -116.12694 | 5731 | 358 |
| Sherwin | city | Idaho | United States | 46.94778 | -116.34694 | 3198 | 284 |
| Sherwood Beach | city | Idaho | United States | 48.49667 | -116.83944 | 2493 | 241 |
| Shiloh | city | Idaho | United States | 48.545 | -116.39444 | 3185 | 223 |
| Shoreline Drive Summer Home Area | city | Idaho | United States | 44.6475 | -115.67667 | 5298 | 84 |
| Shoshone | city | Idaho | United States | 42.93611 | -114.405 | 3982 | 131 |
| Shoup | city | Idaho | United States | 45.37694 | -114.27611 | 4402 | 56 |
| Silver Beach | city | Idaho | United States | 47.94833 | -116.89111 | 2460 | 1396 |
| Silver City | city | Idaho | United States | 43.01694 | -116.73222 | 6420 | 19 |
| Silver Sands Beach | city | Idaho | United States | 47.89222 | -116.88361 | 2309 | 1926 |
| Silver Star | city | Idaho | United States | 42.08194 | -111.95417 | 4603 | 663 |
| Silvertip Landing | city | Idaho | United States | 47.36167 | -116.69167 | 2198 | 332 |
| Silverton | city | Idaho | United States | 47.49306 | -115.95444 | 2801 | 1567 |
| Simplot | city | Idaho | United States | 43.66972 | -116.7325 | 2385 | 16061 |
| Sinclair | city | Idaho | United States | 48.92917 | -116.17583 | 2739 | 476 |
| Sinker historical | city | Idaho | United States | 43.12083 | -116.50972 | 3398 | 19 |
| Slabtown | city | Idaho | United States | 46.87278 | -116.39278 | 3110 | 368 |
| Slacks Corner | city | Idaho | United States | 43.08194 | -116.74111 | 6738 | 19 |
| Slate Creek | city | Idaho | United States | 45.63833 | -116.27944 | 1735 | 272 |
| Slickpoo | city | Idaho | United States | 46.31694 | -116.71 | 2155 | 380 |
| Slocum | city | Idaho | United States | 46.55556 | -116.01528 | 3198 | 61 |
| Smelter Heights | city | Idaho | United States | 47.53917 | -116.15861 | 2424 | 1989 |
| Smelterville | city | Idaho | United States | 47.54278 | -116.18056 | 2431 | 1272 |
| Smith Corrals | city | Idaho | United States | 43.32667 | -113.24528 | 5200 | 69 |
| Smith Springs | city | Idaho | United States | 42.6375 | -113.31056 | 4189 | 86 |
| Smiths Ferry | city | Idaho | United States | 44.30139 | -116.08861 | 4717 | 44 |
| Snow historical | city | Idaho | United States | 46.3 | -116.79083 | 2312 | 405 |
| Soda Springs | city | Idaho | United States | 42.65444 | -111.60389 | 5784 | 190 |
| Soldier | city | Idaho | United States | 43.37028 | -114.79083 | 5088 | 33 |
| Sonna | city | Idaho | United States | 43.60972 | -116.45583 | 2582 | 12244 |
| South Boise historical | city | Idaho | United States | 43.57639 | -116.16556 | 2798 | 33902 |
| South Mountain | city | Idaho | United States | 42.75222 | -116.9225 | 6876 | 19 |
| Southwick | city | Idaho | United States | 46.60361 | -116.47111 | 2900 | 351 |
| Spalding | city | Idaho | United States | 46.44694 | -116.81639 | 889 | 432 |
| Spanish Town historical | city | Idaho | United States | 43.70972 | -115.25417 | 5902 | 61 |
| Spencer | city | Idaho | United States | 44.36056 | -112.18611 | 5836 | 19 |
| Spink | city | Idaho | United States | 44.79028 | -116.04722 | 4891 | 266 |
| Spirit Lake | city | Idaho | United States | 47.96639 | -116.8675 | 2611 | 1008 |
| Spiry Place | city | Idaho | United States | 42.91028 | -116.40639 | 3398 | 19 |
| Springdale | city | Idaho | United States | 42.51556 | -113.69 | 4156 | 4125 |
| Springfield | city | Idaho | United States | 43.08167 | -112.68111 | 4399 | 471 |
| Springston | city | Idaho | United States | 47.47833 | -116.73194 | 2736 | 255 |
| Squirrel | city | Idaho | United States | 44.02722 | -111.29833 | 5551 | 504 |
| Staley Springs | city | Idaho | United States | 44.66028 | -111.43444 | 6469 | 19 |
| Stanford | city | Idaho | United States | 46.83278 | -116.64361 | 2798 | 369 |
| Stanley | city | Idaho | United States | 44.21139 | -114.945 | 6397 | 14 |
| Stanton Crossing | city | Idaho | United States | 43.32778 | -114.31167 | 5203 | 98 |
| Star | city | Idaho | United States | 43.69222 | -116.4925 | 2486 | 3963 |
| Star Ranch Summer Home Area | city | Idaho | United States | 43.91278 | -115.9675 | 4202 | 145 |
| Starkey | city | Idaho | United States | 44.85056 | -116.4475 | 3346 | 119 |
| State Line Village | city | Idaho | United States | 47.70444 | -117.03639 | 2198 | 6813 |
| Steamboat Rock | city | Idaho | United States | 43.44833 | -115.62639 | 4002 | 380 |
| Steamboat Rocks | city | Idaho | United States | 47.91472 | -116.12556 | 3024 | 126 |
| Steamboat historical | city | Idaho | United States | 47.67556 | -116.14389 | 2598 | 126 |
| Sterling | city | Idaho | United States | 43.03806 | -112.73083 | 4360 | 252 |
| Stetson | city | Idaho | United States | 47.285 | -115.77333 | 2598 | 33 |
| Stevens | city | Idaho | United States | 44.84861 | -116.37778 | 3599 | 126 |
| Stibnite | city | Idaho | United States | 44.89833 | -115.33833 | 6578 | 33 |
| Stites | city | Idaho | United States | 46.09167 | -115.97528 | 1397 | 532 |
| Stone | city | Idaho | United States | 42.01639 | -112.69444 | 4498 | 105 |
| Stout Crossing | city | Idaho | United States | 43.15444 | -115.30917 | 5006 | 61 |
| Strevell | city | Idaho | United States | 42.00611 | -113.20278 | 5305 | 55 |
| Striker | city | Idaho | United States | 42.475 | -114.30417 | 4068 | 2654 |
| Stull | city | Idaho | United States | 47.47222 | -115.86361 | 2998 | 773 |
| Sturgeon | city | Idaho | United States | 47.84972 | -116.85972 | 2276 | 2111 |
| Sublett | city | Idaho | United States | 42.31222 | -113.13611 | 4999 | 70 |
| Sugar City | city | Idaho | United States | 43.87306 | -111.7475 | 4898 | 3950 |
| Sugar Loaf | city | Idaho | United States | 42.68139 | -114.37694 | 3799 | 1357 |
| Sun Valley | city | Idaho | United States | 43.69722 | -114.35083 | 5997 | 741 |
| Sunbeam | city | Idaho | United States | 44.27111 | -114.73333 | 6082 | 14 |
| Sunnydell | city | Idaho | United States | 43.68444 | -111.75417 | 4973 | 2731 |
| Sunnyside | city | Idaho | United States | 48.28028 | -116.39611 | 2060 | 1096 |
| Sunnyslope | city | Idaho | United States | 43.58861 | -116.79222 | 2467 | 2358 |
| Sunset historical | city | Idaho | United States | 47.5625 | -115.83444 | 5462 | 125 |
| Swan Falls | city | Idaho | United States | 43.24167 | -116.37333 | 2401 | 352 |
| Swan Lake | city | Idaho | United States | 42.30778 | -111.99806 | 4770 | 340 |
| Swan Valley | city | Idaho | United States | 43.45611 | -111.34083 | 5528 | 49 |
| Swanlake | city | Idaho | United States | 42.31306 | -112.00306 | 4806 | 351 |
| Swartz Corner | city | Idaho | United States | 43.50139 | -116.55417 | 2614 | 28378 |
| Sweeney | city | Idaho | United States | 47.54028 | -116.16861 | 2483 | 1693 |
| Sweet | city | Idaho | United States | 43.97306 | -116.32361 | 2598 | 299 |
| Sweet Sage historical | city | Idaho | United States | 43.82778 | -112.92694 | 4849 | 56 |
| Sweetwater | city | Idaho | United States | 46.3725 | -116.79194 | 1469 | 453 |
| Syringa | city | Idaho | United States | 46.15083 | -115.72611 | 1525 | 14 |
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