M.A.P. Movement Advancement Project
The Movement Advancement Project also known as M.A.P. was founded in 2006, and is an independent think tank that provides rigorous research, insight and analysis that help speed equality for lesbian, gay, bisexual and transgender (LGBT) people. MAP will give you a strong understanding on the breakdown of policies, laws and communities in the United States. and one of my favorite features is their detailed breakdown of State support of transgender rights through maps.