| School | Address | City | Province | Postal Code |
| Sacred Heart Catholic High School | 1 Crusader Way | Newmarket | ON | L3Y 6R2 |
| Sacred Heart High School | 280 Gladstone Ave N | Yorkton | SK | S3N 2A8 |
| Sacred Heart School of Halifax | Sacred Heart School of Halifax | Halifax | NS | B3H 1X8 |
| Sacred Heart School of Montreal | 3635 Atwater Avenue | Montreal | QC | H3H 1Y4 |
| Saint Benedict Catholic Secondary School | 50 Saginaw Parkway | Cambridge | ON | N1R 5W1 |
| Saint David Catholic Secondary School | 4 High Street | Waterloo | ON | N2L 3X5 |
| Saint Georges School Montreal | 3100 The Boulevard | Montreal | QC | H3Y 1R9 |
| Saint Ignatius High School | 285 Gibson Street | Thunder Bay | ON | P7A 2J6 |
| Saint John High School | 170 Prince William Street | Saint John | NB | E2L 2B7 |
| Saint John's Kilmarnock School | Box 179 | Breslau | ON | N0B 1M0 |
| Saint Johns High School | 401 Church Avenue | Winnipeg | MB | R2W 1C4 |
| Saint Joseph Secondary School | 5555 Creditview Road | Mississauga | ON | L5V 2B9 |
| Saint Josephs Morrow Park | 3379 Bayview Avenue | Willowdale | ON | M2M3S4 |
| Saint Michaels Allgrade | PO Box 129 | Arnold Cove | NF A0B 1A0 | |
| Saint Patricks High School | 621 South Selkirk Street | Thunder Bay | ON | P7E 1T9 |
| Saint Thomas Aquinas High School | 541 West Keith Road | North Vancouver | BC | V7M 1M5 |
| Salmon Arm Senior Secondary | P.O. Box 1000 | Salmon Arm | BC | V1E 4P2 |
| Sardis Secondary School | P O Box 100 | Sardis | BC | V2R 1A5 |
| School of Liberal Arts | 36 Eglington Avenue West | Toronto | ON | M4R 1A1 |
| Seaquam Secondary School | 11584 Lyon Road | Delta | BC | V4E 2K4 |
| Seaway District High School | 2 Beach Street | Iroquois | ON | K0E 1K0 |
| Selwyn House School | 95 Cote Saint Antoine road | Westmount | QC | H3Y 2H8 |
| Senator O'Connor College School | 60 Rowena Drive | Toronto | ON | M3A 3R2 |
| Sentinel Secondary School | 1250 Chartwell Drive | West Vancouver | BC | V7S 2R2 |
| Seycove Secondary School | 1204 Caledonia Avenue | North Vancouver | BC | V7G 2A6 |
| Shaftesbury High School | 2240 Grant Avenue | Winnipeg | MB | R3P 0P7 |
| Shawnigan Lake School | 1975 Renfrew Road | Shawnigan Lake | BC | V0R 2W0 |
| Sheldon Williams Collegiate | 2601 Coronation Street | Regina | SK | S4F 0L4 |
| Simcoe Composite School | Wilson Avenue | Simcoe | ON | N3Y 2E5 |
| Simonds High School | 1490 Hickey Road | Saint John | NB | E2L 4E7 |
| Sir Charles Tupper Secondary School | 419 E. 24th Avenue | Vancouver | BC | V5V 2A2 |
| Sir Frederick Banting Secondary School | 125 Sherwood Forest Square | London | ON | N6G 2C3 |
| Sir James Dunn Academy | 180 King Street | St. Andrews | NB | E5B 1Y7 |
| Sir John A. Macdonald High School | 66 Hubley Road | Hubley | NS | B3Z 1B9 |
| Sir John A. Macdonald Secondary School | 650 Laruelwood Drive | Waterloo | ON | N2V 2V1 |
| Sir Winston Churchill | 7055 Heather Street | Vancouver | BC | V6P 3P7 |
| Sir Winston Churchill High School | 5220 Northland Drive Northwest | Calgary | AB | T2L 2J7 |
| Sisler High School | 1360 Redwood Avenue | Winnipeg | MB | R2X 0Z1 |
| South Hill Education Centre | 6010 Fraser Street | Vancouver | BC | V5W 2Z7 |
| South Island Distance Education School (AP@SIDES) | 4575 Wilkinson Road | Victoria | BC | V8Z 7E8 |
| Southridge School | 2656 160th Street | Surrey | BC | V4P 2M7 |
| Spectrum Community Secondary School | 957 West Burnside Road | Victoria | BC | V8Z 6E9 |
| Springbank Community High School | 32226 Springbank Road | Calgary | AB | T2P 2L9 |
| Spruce Grove Composite High School | 1000 Calahoo Road | Spruce Grove | AB | T7X 2T7 |
| St. Andrew's College | 15800 Yonge Street | Aurora | ON | L4G 3H7 |
| St. Basil the Great College School | 3100 Weston Road | Weston | ON | M9M 2S7 |
| St. Bonaventure's College | 2A Bonaventure Avenue | St. John's | NF | A1C 6B3 |
| St. Catharines Collegiate & Vocational Institute | 34 Catherine Street | St. Catherines | ON | L2R 5E7 |
| St. Clement's School | 21 Saint Clements Avenue | Toronto | ON | M4R 1G8 |
| St. Francis High School | 877 Northmount Drive N. W. | Calgary | AB | T2L 0A3 |
| St. Francis Xavier High School | 9250 163 Street N.W. | Edmonton | AB | T5R 0A7 |
| St. Francis Xavier Secondary School | 50 Bristol Rd. West | Mississauga | ON | L5R 3K3 |
| St. George's School | 4175 West 29th Avenue | Vancouver | BC | V6S 1V6 |
| St. John's School | 1811 West 16th Avenue | Vancouver | BC | V6J 2M3 |
| St. John's-Ravenscourt School | 400 South Drive | Winnipeg | MB | R3T 3K5 |
| St. Joseph High School | 115 Nelson Road | Saskatoon | SK | S7H 1H1 |
| St. Joseph's College School | 74 Wellesley Street West | Toronto | ON | M5S 1C4 |
| St. Malachy's Memorial High School | 2 - 20 Leinster Street | Saint John | NB | E2L 1H8 |
| St. Margaret's School | 1080 Lucas Avenue | Victoria | BC | V8X 3P7 |
| St. Mary High School | 380 - 14 Street West | Prince Albert | SK | S6V 3L5 |
| St. Mary's School | 5427 50th Street | Taber | AB | T1G 1G7 |
| St. Mary's Academy | 550 Wellington Crescent | Winnipeg | MB | R3M 0C1 |
| St. Mary's Catholic Secondary School | 66 Dufferin Park Avenue | Toronto | ON | M6H 1J6 |
| St. Mary's College | 130 Wellington Street East | Sault Ste. Marie | ON | P6A 2X1 |
| St. Maurice School Inc. | 1639 Pembina Highway | Winnipeg | MB | R3T 2G6 |
| St. Michael's Choir School | 67 Bond Street | Toronto | ON | M5B 1X2 |
| St. Michael's College School | 1515 Bathurst Street | Toronto | ON | M5P 3H4 |
| St. Michael's School | 864 Christie Avenue | Pincher Creek | AB | T0K 1W0 |
| St. Michaels University School | 3400 Richmond Road | Victoria | BC | V8P 4PS |
| St. Mildred's-Lightbourn School | 1080 Linbrook Road | Oakville | ON | L6J 2L1 |
| St. Patrick Secondary School | 49 Felstead Avenue | Toronto | ON | M4J 1G3 |
| St. Patrick's High School | 281 East Street | Sarnia | ON | N7T 6X8 |
| St. Patrick's Regional Secondary School | 115 E 11th Avenue | Vancouver | BC | V5T 2C1 |
| St. Paul's Collegiate | #3 PR 248 south | Elie | MB | R0H 0H0 |
| St. Pauls High School | 2200 Grant Avenue | Winnipeg | MB | R3P 0P8 |
| St. Peter's Secondary School | 733 Parkhill Road West | Peterborough | ON | K9J 8M4 |
| St. Theresa of Lisieux Catholic High School | 230 Shaftsbury Avenue | Richmond Hill | ON | L4C 0E8 |
| St. Thomas More Collegiate | 7450 12th Avenue | Burnaby | BC | V3N 2K1 |
| Stamford Collegiate | 5775 Drummond Road | Niagara Falls | ON | L2G 4L2 |
| Stanley Humphries Secondary School | 720 7th Avenue | Castlegar | BC | V1N 1R5 |
| Stanstead College | 450 Dufferin Road | Stanstead | QC | J0B 3E0 |
| Stephenville High School | P.O. Box 5100 | Stephenville | NF | A2N 3M6 |
| Steveston Senior Secondary | 10440 Two Road | Richmond | BC | V7E 2E3 |
| Strathcona Composite High School | 10450 72nd Avenue | Edmonton | AB | T6E 0Z6 |
| Strathmore High School | 100 Brent Boulevard | Strathmore | AB | T1P 1V2 |
| Sturgeon Composite High School | Box 100 | Namao | AB | T0A 2N0 |
| Swift Current Comprehensive High School | 1100 11th Avenue Northeast | Swift Current | SK | S9H 2V6 |