Business groups starting with "S" - Sri Homes Inc to St Elizabeth School
- Sri Homes Inc 4
- SRS Web Solutions 2
- Sruta Technologies 3
- SS Medical Products 2
- Ssa Enterprises-Scooter's 2
- SSR Astrologer 2
- St Agnes Church 4
- St Agnes School 6
- St Aidan's Anglican Church 5
- St Alban Anglican Church 3
- St Alban's Anglican Church 5
- St Alban's Church 4
- St Alphonsus School 3
- St Ambrose Church 3
- St Andrew Anglican Church 4
- St Andrew Elementary School 3
- St Andrew Presbyterian Church 4
- St Andrew's Anglican Church 10
- St Andrew's Church 6
- St Andrew's Dental Centre 2
- St Andrew's Presbyterian 4
- St Andrew's Presbyterian Ch 13
- St Andrew's Presbyterian Chr 34
- St Andrew's Presbyterian Chrch 7
- St Andrew's School 3
- St Andrew's United Church 34
- St Andrews Anglican Church 10
- St Andrews Presbyterian Church 34
- St Andrews United Church 15
- St Angela Elementary School 3
- St Ann's Catholic Church 3
- St Ann's Roman Catholic Church 4
- St Ann's School 4
- St Anne Catholic Church 4
- St Anne School 6
- St Anne's Anglican Church 4
- St Anne's Catholic Church 3
- St Anne's Church 3
- St Anne's Roman Catholic Chr 3
- St Ansgar Lutheran Church 3
- St Anthony Elementary School 3
- St Anthony School 5
- St Anthony's Church 10
- St Anthony's Roman Catholic 3
- St Anthony's School 6
- St Augustine Anglican Church 4
- St Augustine School 6
- St Augustine's Anglican Church 3
- St Augustine's Church 4
- St Barnabas Anglican Church 9
- St Barnabas Church 4
- St Bartholomew's Anglican Chr 3
- St Bernadette School 7
- St Bernard School 3
- St Brigid School 4
- St Catharines Celtic Club 2
- St Catharines Civic Emp Cu 3
- St Catharines Community Ctrs 3
- St Catherine's School 3
- St Charles Church 3
- St Charles Garnier School 3
- St Charles School 3
- St Christopher House 3
- St Christopher School 3
- St Clair Paint & Wallpaper 6
- St Clair Shell - CLOSED 2
- St Clair-Paint & Paper People 14
- St Clement's Church 4
- St Columba Presbyterian Church 5
- St David Anglican Church 3
- St David School 3
- St David's Anglican Church 6
- St David's Presbyterian Church 4
- St David's United Church 5
- St Dominic School 4
- St Dominic's Church 3
- St Edwards School 3
- St Elizabeth Church 3
- St Elizabeth Health Care 4
- St Elizabeth School 5