Perhaps this goes without saying, but you have to be registered to vote, and you must vote at a particular polling station (click here to locate it or call 1-866-VOTE-NYC). Registered Democrats can only vote for Democrats, ditto registered Republicans. To see a list of your current representatives, enter your home address here. The polls are open until 9 p.m.
Here's who's running for statewide office:
New York Attorney General Andrew Cuomo, the Democratic candidate for governor, isn't being challenged. In the Republican primary, Rick Lazio faces Carl Paladino.
The following will square off in the Democratic primary for attorney general: Eric Dinallo, Richard Brodsky, Sean Coffey, Kathleen Rice, and Eric Schneiderman. The winner will face Republican Dan Donovan in November's election.
New York Senator Senator Kirsten Gillibrand faces Gail Goode in the Democratic primary. Three Republicans - Bruce Blakeman, David Malpass and Joseph J. DioGuardi - are also after Gillibrand's seat. New York's other senator, Chuck Schumer, doesn't have a primary. On the Republican side, Gary Berntsen is up against Jay Townsend.
On a more local level:
None of the borough's three congressmen, Eliot Engel, Joseph Crowley, or Jose Serrano face a primary opponent. (There are no Republican primaries for Congress, State Senate, or State Assembly, meaning all the races below are Democratic primaries.)
State Senator Jose M. Serrano (28th District) faces Mark Escoffery-Bey
State Senator Eric T. Schneiderman, whose 31st District includes parts of the Bronx and Manhattan, is running for Attorney General. In the race to replace him, Adriano Espaillat faces Mark Levine.
State Senator Ruben Diaz, Sr. (32nd District) faces Charlie Ramos
State Senator Pedro Espada, Jr. (33rd District) faces Gustavo Rivera
Incumbents Ruth Hassell-Thompson and Jeff Klein don't have primary opponents.
Assemblyman Peter Rivera (76th District) faces Luis Sepulveda
Assemblyman Jose Rivera (78th District) faces Sergio Villaverde
Assemblyman Michael Benjamin (79th District) is stepping down. Eric Stevenson is running unopposed in the primary.
Assemblywoman Naomi Rivera (80th District) faces Robert Giuffre
Assemblyman Michael Benedetto (82nd District) faces Herbert Moreira-Brown and Rafael Dominguez
Assemblyman Marcos Crespo (85th District) faces Israel Cruz
Assemblyman Nelson L. Castro (86th District) faces Hector Ramirez