Washington, D.C., doesn't just represent all 50 states politically. Its city planners incorporated the states into the District's map, naming major avenues after them.
In this video, Steve Goehrke bikes all of D.C's state-named avenues. He explains, on his YouTube page:
Over the summer of 2011 I embarked on a project to bike and document all 50 state avenues in Washington DC. Here is the final product. The filming took place over the course of 4 days. When possible state avenues are represented with landmarks the streets are near/well known for. Certain states do appear more than once but are only credited once.