Tuesday April 19 is Election Day in New York. Polls are open from 6 a.m. to 9 p.m in New York City and Nassau, Suffolk, Westchester, Rockland, Orange, Putnam and Erie counties. Polls in all other New York counties are open from noon to 9 p.m. Here's what you need to know about voting in New York.

1. Who can vote?

First, you must be a registered Democrat or Republican to vote in the presidential primary. And you must have registered to vote by March 25th. The deadline to switch parties was in October. Unlike some other states, New York does not have same-day voter registration.

All registered voters, regardless of party affiliation, in four state legislative districts can get a separate ballot to vote in a special election to fill a vacant seat. These districts have a special election:

• 9th Senate District District (Part of Nassau County)
• 59th Assembly District (Part of Brooklyn)
• 62nd Assembly District District (Part of Staten Island) - This election is uncontested.
• 65th Assembly District (Part of Lower Manhattan) 

Check the New York Board of Elections page to see if you are registered and which district you are in.

2. Where do I vote?

Look up your polling location on the New York City or New York State polling location website. The New York City poll site locator has sample ballots as well. Select "Ballot Information" for the April 19 election after entering your address.

Tip for New York City voters:

When you write down your poll site address also note the number of your Election/Assembly District. These two pieces of information will help you move faster through your poll site, skipping the line at the information desk and going straight to the table where you sign the poll book.

What if I have a problem at the polls?

If your name is not in the poll books and you believe it should be, ask for an affidavit ballot. After polls close, the Board of Elections will check to see if you are eligible, and your vote will be counted if you are.

State Attorney General Eric Schneiderman's hotline for poll site issues is 800-771-7755. This line will be staffed by attorneys in the office's Civil Rights Bureau. Complaints can also emailed to civil.rights@ag.ny.gov between 6 a.m. and 9 p.m. on Tuesday.

3. How soon will we know who won?

After polls close at 9 p.m., check out our website for live results of the presidential primary. We will also have live special coverage from 8 p.m. - 10 p.m. on 93.9 FM, AM 820 and here on wnyc.org.

UPDATE: Information about the deadline to switch parties, sample ballots, affidavit ballots and Attorney General Eric Schneiderman's hotline was added 3:30 p.m., April 18, 2016.