New York City voters are going to the polls Tuesday to choose the next Democratic nominee for mayor — a race that’s narrowed into a contest between two men from different generations: former Gov. Andrew M. Cuomo, age 67, and State Assemblyman Zohran Mamdani, 33.

Poll sites, more than 3,000 voting machines, open at 6 a.m. and close at 9 p.m.

But don’t expect to find out Tuesday evening who won.

Under the city’s ranked choice voting system, unless one candidate gets more than 50% — which opinion surveys predict is unlikely — the winner won’t be known until at least July 1, when the ranked choice tabulations are scheduled to be run by the city’s Board of Election.

So far, almost double the number of voters have cast ballots in early voting, which began June 14 and ended Sunday, in the current primary than four years ago, when Eric Adams won the nomination and went on to become the 110th mayor since 1665, when the British captured New Amsterdam.

Cuomo, who in 2021 resigned the governorship in scandal, had been the clear favorite, with a double-digit lead in every poll since even before he entered the race in March.

But in recent weeks, support for Mamdani, whose government service began in 2021, and his leftist agenda have skyrocketed, tightening the race to a place where a poll released on the eve of Election Day had Mamdani topping Cuomo.

Mamdani, a democratic socialist, has said he wants taxes to be raised on the richest New Yorkers to fund social programs, including child care and free public buses. He also has promised to implement a rent freeze on regulated apartments and open municipal grocery stores.

Cuomo says he’s a veteran government executive who would hire more police officers, build more housing, remove homeless people from subways, and restrict e-bikes and scooters.

Both men say they’re best positioned to resist the policies of President Donald Trump and have disagreed over Israel.

There are at least nine major nominees for the Democratic nomination, including Brad Lander, the current city comptroller; Scott Stringer, the former comptroller; Adrienne Adams, the City Council speaker; and Zellnor Myrie, a state senator. Opinion polls show that only Cuomo and Mamdani have a shot at winning.

Eric Adams had been running as a Democrat but withdrew from the race earlier this year after being denied public matching funds due to campaign finance fraud allegations against him. He is planning to run as an independent against whoever wins the Democratic primary.