Here's what I like about this infographic. It not only let's you see data by location but also by mental illness, weapons legally acquired, venue, weapon type, race, gender, and year. Be sure to click on the map to enlarge it so you can see the graph.
Take a look at the actual data:
https://docs.google.com/spreadsheet/pub?key=0AtIWtgxch7DtdERIVnowSkx4NGRjN3E4UjdWMHNRY3c&output=html
