I'm starting a new series called "Taking the Bus," where I'll look at bus lines that go through Columbia Heights and where you can take them.
The first installment is the H2, H3 and H4. These lines are handy for me because they cut across the city east to west, ending at the the Van Ness (H2) and Tenleytown Metros (H3, H4), meaning you don't have to ride the Metro down to Gallery Place to get on the Red Line to get there. The lines are handy for trips to Whole Foods, Tenleytown, Fort Reno, and stuff like that.
Both lines go down Columbia Road westbound and Harvard Street eastbound through the neighborhood, then go on Porter and Quebec. To the east, they go past the Washington Hospital Center and end up at the Brookland Metro near Catholic University. It's a pretty handy bus route - check it out at Metro's site.