Idaho Cities
- Sagle, ID
- Saint Anthony, ID
- Saint Charles, ID
- Saint Joe, ID
- Saint Johns, ID
- Saint Maries, ID
- Salem, ID
- Salmon, ID
- Sam, ID
- Samaria, ID
- Samuels, ID
- Sand Hollow, ID
- Sanders, ID
- Sandpoint, ID
- Santa, ID
- Sawyer, ID
- Schiller, ID
- Schnoors, ID
- Schodde, ID
- Schow, ID
- Scoville, ID
- Seaburg, ID
- Sebree, ID
- Selby, ID
- Selle, ID
- Seneacquoteen, ID
- Setters, ID
- Sharon, ID
- Shelley, ID
- Shells Lick, ID
- Sherwin, ID
- Sherwood Beach, ID
- Shiloh, ID
- Shoshone, ID
- Shoup, ID
- Silver Beach, ID
- Silver City, ID
- Silver Sands Beach, ID
- Silverton, ID
- Simplot, ID
- Sinclair, ID
- Slate Creek, ID
- Slickpoo, ID
- Smelterville, ID
- Smith Corrals, ID
- Smith Springs, ID
- Smiths Ferry, ID
- Soda Springs, ID
- Soldier, ID
- Sonna, ID
- South Mountain, ID
- Southwick, ID
- Spalding, ID
- Spencer, ID
- Spirit Lake, ID
- Springdale, ID
- Springfield, ID
- Springston, ID
- Squirrel, ID
- St. Anthony, ID
- St. Charles, ID
- St. Maries, ID
- Staley Springs, ID
- Stanford, ID
- Stanley, ID
- Star, ID
- Starkey, ID
- State Line, ID
- Steamboat Rock, ID
- Steamboat Rocks, ID
- Sterling, ID
- Stetson, ID
- Stevens, ID
- Stibnite, ID
- Stites, ID
- Stone, ID
- Strevell, ID
- Stull, ID
- Sturgeon, ID
- Sublett, ID
- Sugar City, ID
- Sugar Loaf, ID
- Sun Valley, ID
- Sunbeam, ID
- Sunnydell, ID
- Sunnyside, ID
- Sunnyslope, ID
- Swan Valley, ID
- Swanlake, ID
- Sweeney, ID
- Sweet, ID
- Sweetwater, ID
- Syringa, ID
