Since Connecticut doesn't border Canada, as you can see in this map
Map of Connecticut, Connecticut Map
and Norwalk is at the southern end of Connecticut, you'll have to go north through the state of CT and whatever other state is between CT and your focus Canada city.
This map is also helpful -- it's a PDF; where it says 82.2% click on the down arrow and select 150% or more to see all the details clearly.
http://www.milebymile.com/maps/Connecticut_road_map.pdf
This map shows the relationship between Montreal or Toronto and New York City (near Norwalk in this scale) --
Map of North America
Mapquest.com is really helpful. And you can Google for any map you want.