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| Tribe | State(s)/Province(s) |
| Sac and Fox | IA, IL, MO, WI |
| Sahewamish | WA |
| Sahnish | ND |
| Salinan | CA |
| Salish | MT |
| Samish | WA |
| Sanpoil | WA |
| Santee | SC |
| Saponi | NC, VA |
| Sarcee | BC |
| Satsop | WA |
| Saturiwa | FL |
| Sauk | IA, IL, MO, WI |
| Sawokli | AL, FL, GA |
| Sechelt | BC |
| Sekani | AB,BC |
| Semiahmoo | BC, WA |
| Seminole | FL, OK |
| Senijextee | BC, WA |
| Serrano | CA |
| Sewee | SC |
| Shasta | CA, OR |
| Shawnee | IN, KA, KY, MO, OK, PA, SC, TN |
| Shuman | CH, TX |
| Shuswap | BC |
| Siksika | AB |
| Siletz | OR |
| Siletz Confederacy | OR |
| Sinkyone | CA |
| Sioux | AB, MB, MN, MT, NE, ND, SD, SK |
| Sissipahaw | NC |
| Suislaw | OR |
| Skagit | WA |
| Skokomish | WA |
| Slavey | AB, BC, NT |
| Snohomish | WA |
| Snoqualmie | WA |
| Snuneymuxw | BC |
| Sobaipuri | AZ, SN |
| Songhees | BC |
| Southern Paiute | CA, NV, OR, UT |
| Spokane | MT, WA |
| Squamish | BC |
| Stockbridge | NY, WI |
| Suquamish | WA |
| Susquehannock | NY, PA, OK |
| Swinomish | WA |