For the franchise history, that is 31 games by Vladimir Guerrero in the 1999 season. For the Washington Nationals part of the franchise history, that is 30 games by Ryan Zimmerman in the 2009 season.
33 by George Davis in 1893
Joe Dimaggio 1941 56 straight games
Mickey Mantle's longest hitting streak was 16 games.
20
Miguel Cabrera
For the 2009 season, through games played on May 2 that is 21 games by Ryan Zimmerman of the Washington Nationals.
Ichiro
Joe DiMaggio
34 by Benito Santiago in 1987
Jason bartlett 19 games
33 by George Davis in 1893
The Washington Nationals / Montreal Expos franchise has the longest current streak of seasons not making the playoffs. They have not made the playoffs since 1981.
Joe Dimaggio 1941 56 straight games
Mickey Mantle's longest hitting streak was 16 games.
Dom DiMaggio had an amazing streak of 34 games in 1949.
In the Washington/Oregon rivalry, Washington's longest winning streak is 6 games (1981-1986, 1974-1979, 1955-1960, 1908-1909 and 1911-1914) and Oregon's longest winning streak is 7 games (2004-2010).
walter johnson