| Sacred Heart Monastery | | | | |
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| Sacred Hearts Grade School | | | | |
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| Saint Adalbert School | 1913 W Becher St, Milwaukee | | | |
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| Saint Aloysius School | | | | |
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| Saint Andrews Evangelical Lutheran School | | | | |
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| Saint Anthony Lower Elementary | 1669 S 5th St, Milwaukee | | | |
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| Saint Augustine School | | | | |
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| Saint Bernadette School | | | | |
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| Saint Casimir School | | | | |
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| Saint Charles Borromeo School | | | | |
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| Saint Charles DTC | 151 S 84th St, Milwaukee | | | |
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| Saint Francis High School | 4225 S Lake Dr, Saint Francis | | | |
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| Saint Frederick School | | | | |
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| Saint Galls School | | | | |
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| Saint James School | | | | |
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| Saint Joan Antida High School | 1341 N Cass St, Milwaukee | | | |
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| Saint Joan Antide Institution | | | | |
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| Saint John Kanty School | | | | |
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| Saint John Lutheran Grade School | | | | |
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| Saint Josaphat Parish School | 801 W Lincoln Ave, Milwaukee | | | |
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| Saint Jude | 800 N Glenview Ave, Wauwatosa | | | |
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| Saint Lucas Lutheran School | 648 E Dover St, Milwaukee | | | |
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| Saint Marcus Lutheran School | | | | |
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| Saint Marcus School North Campus | 2669 N Richards St, Milwaukee | | | |
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| Saint Mark Lutheran School | | | | |
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| Saint Mary Parish School | | | | |
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| Saint Marys School | | | | |
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| Saint Matthews Elementary School | | | | |
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| Saint Nicholas School | | | | |
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| Saint Pauls Lutheran School | 6881 S 51st St, Franklin | | | |
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| Saint Pauls School | | | | |
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| Saint Pius X School | | | | |
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| Saint Stephen School | | | | |
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| Saint Stephens School | | | | |
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| Saint Thomas More High School | | | | |
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| Saints Cyril and Methodius School | 2433 S 15th St, Milwaukee | | | |
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| Saints Peter and Paul School | | | | |
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| Salem Lutheran School | | | | |
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| Samuel Clemens School | 3600 W Hope Ave, Milwaukee | | | |
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| Seeds of Health Elementary | 1445 S 32nd St, Milwaukee | | | |
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| SFE Milwaukee Scholars | 7000 W Florist Ave, Milwaukee | Active | | |
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| Shalom High School | 1749 N 16th St, Milwaukee | | | |
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| Shepard Hills Elementary | | Active | | |
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| Sherman Elementary School | | Active | | |
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| Sherman Multicultural Arts Elementary School | 5110 W Locust St, Milwaukee | | | |
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| Shorewood High | | Active | | |
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| Shorewood High School | | | | |
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| Shorewood Intermediate | | Active | | |
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| Shorewood Intermediate School | | | | |
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| Siefert Elementary School | 1547 N 14th St, Milwaukee | | | |
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| Siloah Lutheran School | 3721 N 21st St, Milwaukee | | | |
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| South Accelerated Academy | | Active | | |
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| South Division High School | | Active | | |
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| South Division High School | 1515 W Lapham St, Milwaukee | | | |
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| South Milwaukee High School | 801 15th Ave, South Milwaukee | | | |
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| South Milwaukee Middle | | Active | | |
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| Southwood Glen Elementary | | Active | | |
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| Southwood Glen Elementary School | | | | |
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| St Alphonsus School | | | | |
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| St Vincent Pallotti School | | | | |
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| St. Anthony Upper Elementary | 1747 S 9th St, Milwaukee | | | |
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| St. Augustine Prep | 2607 S 5th St, Milwaukee | | | |
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| St. Catherine School | 2647 N 51st St, Milwaukee | | | |
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| St. Catherine's Grade School | 8660 N 76th Pl, Milwaukee | | | |
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| St. Francis Children's Center | | | | |
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| St. Gregory the Great School | | | | |
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| St. John Paul II Catholic School | 3329 S 10th St, Milwaukee | | | |
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| St. John Paul II Catholic School - Middle School Campus | 3344 S 16th St, Milwaukee | | | |
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| St. John the Evangelist School | 8500 W Coldspring Rd, Greenfield | | | |
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| St. John's Evangelical Lutheran School | 1278 Dewey Ave, Wauwatosa | | | |
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| St. Joseph Academy | 1600 W Oklahoma Ave, Milwaukee | | | |
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| St. Joseph Catholic School | 2750 N 122nd St, Wauwatosa | | | |
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| St. Margaret Mary School | 3950 N 92nd St, Milwaukee | | | |
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| St. Martini Lutheran School | | | | |
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| St. Matthias School | | | | |
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| St. Monica School | | | | |
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| St. Paul's Lutheran Grade School | 7821 W Lincoln Ave, West Allis | | | |
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| St. Paul's Lutheran School | 3766 E Cudahy Ave, Cudahy | | | |
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| St. Peter-Immanuel Lutheran School | | | | |
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| St. Rafael the Archangel School North Campus | 2251 S 31st St, Milwaukee | | | |
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| St. Rafael the Archangel School South Campus | 2251 S 31st St, Milwaukee | | | |
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| St. Robert School | 2220 E Capitol Dr, Shorewood | | | |
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| St. Sebastian School | | | | |
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| Starms Early Childhood Center | | | | |
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| Starms Early Childhood Center | | Active | | |
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| Stellar Collegiate Charter School | 1115 S 7th St, Milwaukee | | | |
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| Stormonth Elementary | | Active | | |
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| Stormonth School | 7301 N Longacre Rd, Fox Point | | | |
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| Story Elementary | | Active | | |
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| Story School | | | | |
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| Stuart Elementary | | Active | | |
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