If you live and vote in the District, beware. The D.C. Voter Guide is flawed and will point you to the wrong polling place, the AP, via WTOP, is reporting. The Post has more on the story. Guides that were sent out to voters for the upcoming primary indicated that a code on the mailing label would tell the receipient which polling station to report to.
From WTOP:
But there is no precinct number on the label only a meaningless mass-mailing code. If a voter uses that number, they would show up not only at the wrong polling place but in many cases, the wrong ward altogether.
To figure out which polling station you should go to, check out the D.C. Citizen Atlas.