Maryland and District of Columbia Republicans will get their chance to weigh in on the GOP presidential primary Tuesday.

Former House speaker and Republican presidential candidate Newt Gingrich (R-Ga.) addresses a town hall-style meeting at the Hodson Auditorium at Hood College on April 2 in Frederick, Md. (Chip Somodevilla/Getty Images)

Maryland will award 37 delegates D.C. has 19. Both contests are winner-take-all.

Here are full details on how to follow the D.C. and Maryland primaries.

Who is vying for the delegates?

In addition to the Republican presidential primary, D.C. voters will choose D.C. council candidates, and Maryland will hold congressional primary elections

Former Massachusetts governor Mitt Romney, former Pennsylvania senator Rick Santorum, Rep. Ron Paul (Tex.) and former House speaker Newt Gingrich (Ga.) are all on the ballot in Maryland. Santorum is not on the ballot in D.C.

What is the schedule?

Polls are open in Maryland and D.C. from 7 a.m. ET to 8 p.m. ET.

How do I follow the primary on social media?

#MDPrimary and #DCPrimary are the Twitter hashtags for election news and updates. You can follow the best political tweeters for GOP primary news here.

We’re also asking readers in the primary states to share news, photos and tweets about what they’re seeing on election day using the hashtag #VoteWatch.

Tweet #VoteWatch

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