I really think in this era of the internet and smartphones, phone books should be something people request, not something that just gets dumped and ends up being litter. I know some people do need them, and I am obviously more techie than some people (I run a blog after all) but I can't even think of the last time I used a phone book. Many, many years. It's a shame to see so much paper wasted and trash created for this artifact.
I tried to find a way to stop delivery, but the yellowpages.com page that is for stopping it doesn't include DC as an option. Weird.
UPDATE: I found the site where you can opt-out of the phone books. Finally.