The second largest immigration from Ireland was into Canada. Many immigrants came from Canada into the U.S. through northern routes from Canada to the northern states of the U.S.
For supplimental information regarding this map see article titled United Kingdom and Ireland Passenger Lists by Dwight A. Radford in the October 2010 issue of The Septs journal.
Maps are a helpful tool in research. IGSI will continually add to the collection of maps on this site. Some will just be for filling in on your own while others will be to pinpoint information you may need.