The numbers you have gathered  from the On-Line Historical Census only give you an indication of  migration patterns.  In and of themselves they tell us little about the immigrants themselves.   One way to spin-off of this research into research that introduces us to the peoples of this immigration is by doing oral histories.  The best place to start your oral history is within your own family or friends.   Find out when they arrived in this area, and run a census count on the area they left and the area they came to.  After that, do an oral history based on one of the pages or models below:
 

Learning About Immigration Through Oral History - The Library of Congress lesson plan for formal oral histories of immigrants.