SOSSA membership includes schools represented by Conseil scolaire catholique MonAvenir, District School Board of Niagara (DSBN), Hamilton-Wentworth District School Board (HWDSB), Niagara Catholic District School Board and some independent schools.
Ancaster Secondary – 374 Jerseyville Rd., Ancaster L9G 3K8
Bernie Custis Secondary School – 1055 King St. East, Hamilton L8M 1E2
Dundas Valley Secondary – 310 Governor’s Rd, Dundas L8H 3P8
École secondaire Georges‑P. Vanier – 100 Macklin N., Hamilton L8S 3S1
Glendale Secondary – 145 Rainbow Dr., Hamilton L8K 4G1
Guido de Brès Christian High School – 420 Crerar Dr., Hamilton L9A 5K3
Hamilton District Christian – 92 Glancaster Rd., Ancaster L9G 3K9
Nora Henderson – 75 Palmer Rd., Hamilton L8T 3G1
Orchard Park Secondary – 200 DeWitt Rd., Stoney Creek L8E 4M5
Saltfleet Secondary – 108 Highland Rd W., Stoney Creek L8J 2T2
Sherwood Secondary – 25 High St., Hamilton L8T 3Z4
Sir Allan MacNab Secondary – 145 Magnolia Dr., Hamilton L9C 5P4
Sir Winston Churchill Secondary – 1715 Main St E., Hamilton L8H 1E3
Waterdown District High – 215 Parkside Dr., Waterdown L0R 2H0
Westdale Secondary – 700 Main St W., Hamilton L8S 1A5
Westmount Secondary – 39 Moncalm Dr., Hamilton L9C 4B1
Blessed Trinity – 145 Livingston Ave., Grimsby L3M 5J6
Denis Morris – 40 Glen Morris Dr., St. Catharines L2T 2M9
Holy Cross – 460 Linwell Rd., St. Catharines L2M 2P9
Lakeshore Catholic – 150 Janet St., Port Colborne L3K 2E7
Notre Dame – 64 Smith St., Welland L3C 1L1
St. Francis – 541 Lake St., St. Catharines L2N 4H7
St. Michael – 8699 McLean Rd., Niagara Falls L2E 6S5
St. Paul – 3834 Windermere Rd., Niagara Falls L2J 2Y5
A N Myer – 6338 O’Neil, Niagara Falls L2J 1M7
Franco‑Niagara – 670 Tanquary Ave, Welland L3B 4G2
Eastdale – 170 Wellington Ave, Welland L3B 1B3
E L Crossley – 350 Highway 20, Fonthill L0S 1E0
Greater Fort Erie – 1640 Garrison Rd., Fort Erie L2A 5M4
Saint‑Jean‑de‑Brébeuf – 620 River Rd, Welland L3B 5N6
Niagara Christian – 2619 Niagara Pkwy, Fort Erie L2A 5M4
Port Colborne – 211 Elgin St, Port Colborne L3K 3K4
Stamford – 5775 Drummond Rd, Niagara Falls L2G 4L2
Welland Centennial – 240 Thorold Rd W, Welland L3C 3W2
Westlane – 5960 Pitton Rd, Niagara Falls L2H 1T5
DSBN Academy – 130 Louth St, St. Catharines L2S 2T4
Eden High School – 535 Lake St, St. Catharines L2N 4H7
Governor Simcoe S.S. – 15 Glenview St., St. Catharines L2N 4H7
Great Lakes Christian High School – 4875 King St, Beamsville L0R 1B0
Heritage Christian School – 2850 4th Ave (PO Box 400), Jordan L0R 1S0
Laura Secord S.S. – 349 Niagara St, St. Catharines L2M 4V9
Sir Winston Churchill S.S. – 101 Glen Morris Dr, St. Catharines L2T 2T1
Smithville Christian High School – 6488 Smithville Rd, Smithville L0R 2A0
St. Catharines Collegiate – 34 Catherine St, St. Catharines L2R 5E7
Thorold S.S. – 50 Ormond St. N, Thorold L2V 1Z1
West Niagara Secondary School – 5699 King St, Beamsville L0R 1B3