Rappahannock Oyster Bar DC outpost of the Rappahannock River raw-bar empire, nestled into the Union Market. Avg. rating 4 Love0 1309 5th St NE, Washington, DC 20002, USA DirectionsFrom: Rappahannock Oyster Bar (1 Rating) Abbie Boots Roberts on February 8, 2018 at 9:51 pm Rating 4 Oyster chowder is amazing! I prefer my oysters raw but this is a must try if you find yourself at Union Market. Submit a Rating Cancel replySign up now to post your rating, or login here.