Washington Nationals | 41,358 followers on LinkedIn. 2019 World Series Champions | est. 2005 | The Washington Nationals are a Major League Baseball team based in Washington, D.C. The Nationals are a member of the East Division of MLB’s National League. Nationals Park, located on the Anacostia River in Southeast Washington, was the first Major League Baseball stadium in America to earn the LEED-certified Silver designation by the U.S.