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- Saint Charles School District (St. Charles County)
- Saint James R-1 School District (Phelps County) web site
- Saint Joseph School District
- Saint Louis Public Schools
- Savannah R-III School District (Andrew County) web site
- Sedalia#200 School District (Pettis County)
- Seymour School District (Webster County) web site
- Sikeston R-6 School District (Scott County) web site
- Smithville R-II School District (Clay County) web site
- South Callaway R-II School District (Callaway County) web site
- South Iron R-I School District in Annapolis (Iron County) web site
- Springfield R-XII Public School District (Greene County) web site
- Stewartsville C-2 School District (Dekalb County) web site
- Stover School District (Morgan County)
- Strafford R-VI School District (Greene County)
- Strain Japan R-16 School District (Franklin County)
- Sturgeon School District (Boone County)
- Sullivan School District (Franklin County)
- Sunrise R-9 School District (Jefferson County)
- Swedeborg R-III School District (Pulaski County) web site
Read more about this topic: List Of School Districts In Missouri