K1S is a Forward Sortation Area Code (FSA), It is located in The Glebe / Old Ottawa South / Old Ottawa East / Carleton University / Dow's Lake area Ottawa in Ontario, Canada. FSA is a geographical region in which all postal codes start with the same three characters. K1S is an Urban FSA code. The main area code of the area of K1S is 613 343. There are about 951 postal codes.