Reddit user academiaadvice maps the rate of gun homicides per 100,000 residents by state from 2007 to 2016 (above).
From 2015: Business Insider’s map showing, by state, the rate of gun ownership. Note that the two maps do not precisely correlate. [both via Boing Boing]
The Washington Post has maps of Marjory Stoneman Douglas High School in Parkland, Florida—where last week’s shooting took place—and its surrounding area.