- Sabinal (Population: 1,586)
- Sachse (Population: 9,751)
- Saginaw (Population: 12,374)
- Salado (Population: 3,475)
- San Angelo (Population: 88,439)
- San Antonio (Population: 1,144,646)
- San Augustine (Population: 2,475)
- San Benito (Population: 23,444)
- San Carlos (Population: 2,650)
- San Diego (Population: 4,753)
- San Elizario (Population: 11,046)
- San Juan (Population: 26,229)
- San Leon (Population: 4,365)
- San Marcos (Population: 34,733)
- San Saba (Population: 2,637)
- Sanger (Population: 4,534)
- Sansom Park (Population: 4,181)
- Santa Anna (Population: 1,081)
- Santa Fe (Population: 9,548)
- Santa Rosa (Population: 2,833)
- Scenic Oaks (Population: 3,279)
- Schertz (Population: 18,694)
- Schulenburg (Population: 2,699)
- Scissors (Population: 2,805)
- Seabrook (Population: 9,443)
- Seadrift (Population: 1,352)
- Seagoville (Population: 10,823)
- Seagraves (Population: 2,334)
- Sealy (Population: 5,248)
- Sebastian (Population: 1,864)
- Seguin (Population: 22,011)
- Seminole (Population: 5,910)
- Serenada (Population: 1,847)
- Seth Ward (Population: 1,926)
- Seven Points (Population: 1,145)
- Seymour (Population: 2,908)
- Shady Hollow (Population: 5,140)
- Shady Shores (Population: 1,461)
- Shallowater (Population: 2,086)
- Shamrock (Population: 2,029)
- Shavano Park (Population: 1,754)
- Sheldon (Population: 1,831)
- Shenandoah (Population: 1,503)
- Shepherd (Population: 2,029)
- Sherman (Population: 35,082)
- Shiner (Population: 2,070)
- Shoreacres (Population: 1,488)
- Sienna Plantation (Population: 1,896)
- Silsbee (Population: 6,393)
- Sinton (Population: 5,676)
- Skidmore (Population: 1,013)
- Slaton (Population: 6,109)
- Smithville (Population: 3,901)
- Snyder (Population: 10,783)
- Socorro (Population: 27,152)
- Somerset (Population: 1,550)
- Somerville (Population: 1,704)
- Sonora (Population: 2,924)
- Sour Lake (Population: 1,667)
- South Alamo (Population: 3,101)
- South Houston (Population: 15,833)
- South Padre Island (Population: 2,422)
- South Point (Population: 1,118)
- Southlake (Population: 21,519)
- Southside Place (Population: 1,546)
- Sparks (Population: 2,974)
- Spearman (Population: 3,021)
- Splendora (Population: 1,275)
- Spring (Population: 36,385)
- Spring Valley (Population: 3,611)
- Springtown (Population: 2,062)
- Spur (Population: 1,088)
- St. Hedwig (Population: 1,875)
- Stafford (Population: 15,681)
- Stamford (Population: 3,636)
- Stanton (Population: 2,556)
- Stephenville (Population: 14,921)
- Sterling City (Population: 1,081)
- Stinnett (Population: 1,936)
- Stockdale (Population: 1,398)
- Stowell (Population: 1,572)
- Stratford (Population: 1,991)
- Sudan (Population: 1,039)
- Sugar Land (Population: 63,328)
- Sullivan City (Population: 3,998)
- Sulphur Springs (Population: 14,551)
- Sundown (Population: 1,505)
- Sunnyvale (Population: 2,693)
- Sunray (Population: 1,950)
- Sweeny (Population: 3,624)
- Sweetwater (Population: 11,415)
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