Saint Catharines categories of City
- Beamsville, Ontario City
- at L0R
- Chisholm, Ontario City City
- at P0H 1Z0
- Montebello, Quebec City City
- at J0V 1L0
- Port Dalhousie, Ontario City City
- at
- Port Weller, Ontario City City
- at
- Queenston, Ontario City
- at L0S
- Saint Catharines, Ontario City
- at
- Saint Catherines, Ontario City
- at
- St. Catharines City City
- at L2M-L2W, L0S
- St. Catherine's, Ontario Public Services & Government City
- at
- Stratford, Ontario City City
- at N4Z, N5A
- Thorold, Ontario City City
- at