I’m a firm believer that Columbia Heights is the best place in the US to see 4th of July fireworks — you get a great view of the Mall from rooftops, and tons of people shoot off their own around the neighborhood.
I found a number of videos of fireworks in the neighborhood, both of the local stuff being shot off, and of views towards the Mall. Take a look, and if you know of others, let us know in the comments!
About 13th and Park, a local display:
The downtown fireworks:
Some dudes in an alley:
From a roof, towards downtown