One of three markets in the Yes! chain of organic markets in DC, the eastern market store caters to the quick meal crowd. Although the aisles are small and things can get a little tight during the after work hours, Yes! has everything the DC veggie needs for a healthy meal. The staff is friendly, helpful, and knowledgeable about where to find all your needs in the well-packed and -stocked store. Although it isn't Whole Foods, Yes! offers a wide variety in a small space and is conveniently located just a few steps away from Eastern Market.
Of course, be prepared to pay a premium. Unfortunately, organic food still costs quite a bit more than what you find at your neighborhood grocery store, but it makes up for it in flavor!
The only hesitation I have with Yes! is the produce, but that is only due to the fact that you are two blocks from Eastern Market, where fresh produce, meat, and dairy products can be found year round. Without a doubt, Yes! is the best organic store on the Hill - they also offer a great variety of wines!