Democratic socialist Zohran Mamdani said Monday he’s raised $8 million to become New York City’s next mayor – as lefties such as “Sex and the City” star Cynthia Nixon rally around his increasingly formidable campaign.

Mamdani, 33, announced the massive projected haul as a new poll – exclusively obtained by The Post – showed his support jumping to 18% and a clear second-place finish in the crowded Democratic mayoral ranked-choice primary, behind ex-Gov. Andrew Cuomo, with a commanding 41% support.

The once-dark horse campaign is expected to hit the fundraising cap set by the city’s Campaign Finance Board with a groundswell of small-dollar contributions, including nearly 2,400 donors who don’t even have jobs, records show.

“We are the first of any campaign in this entire cycle to accomplish this and we believe the fastest of any in New York City mayoral history,” Mamdani said during a celebratory rally outside City Hall.

“This has been made possible by contributions from close to 18,000 individuals.”

Mamdani also said he’ll stop fundraising – a decision that reflects his confidence that the campaign finance board will soon shell out lucrative matching funds for him.

The Queens state Assembly member’s campaign to unseat Mayor Eric Adams has steadily gained momentum with a mix of slick TikTok videos and a litany of unapologetic progressive promises, from city-run grocery stores to a rent freeze.

The recent poll conducted by the Honan Strategy Group for Tusk Strategies showed Mamdani had gained 6 points of support since its last survey of Big Apple Democratic primary voters in February.

Mamdani would last through eight rounds of ranked-choice voting, before losing to Cuomo by a 66% to 34% margin, the poll found.

His growing support has translated into big bucks from an army of small donors, campaign finance records show.

He has also attracted high-profile supporters, such as Nixon – who made a progressive run against Cuomo for governor in 2018 before returning to play Miranda in the “Sex and the City.”

Nixon recently hosted a fundraiser for Mamdani.

“He is a miracle worker,” the star gushed in a video she posted on Instagram.

Progressive supporters included Ana Maria Achila, co-director of the lefty New York Working Families Party, who contributed $200, records show.

The donations to Mamdani’s campaign also counted $250 from Lindsey Boylan, a former aide to Cuomo who was the first woman to publicly accuse the then-governor of sexual harassment, before he resigned in 2021. The now-mayoral frontrunner has denied the allegations.

His successor Gov. Kathy Hochul’s senior speech writer Julian Gerson gave $300 to Mamdani. 

Nearly 200 employees at Columbia University – which has been rocked by anti-Israel, pro-Palestinian protests amid the war in Gaza – have contributed to Mamdani’s campaign, records show.

Mamdani has been obliquely slammed by Adams as an antisemite, owing to his harsh criticism of Israel and support from the Democratic Socialists of America.

Four attorneys from Gibson Dunn, the prominent law firm where independent mayoral candidate Jim Walden and Adams’ new First Deputy Mayor Randy Mastro worked, also contributed to Mamdani.

Likewise, an attorney at Pitta LLP – the firm that represents Adams’ campaign and defense fund – shelled out cash to Mamdani.

The donations include employees from Google, Meta and Amazon and nearly 2,400 people listed as “not employed,” records show.

“We have built a small-dollar support network that has given us an average donation of somewhere around $80,” he said.

“This is in contrast to Andrew Cuomo, whose average donation is five to six times as much … Our donors are a more accurate reflection of this city and you can see that just in the scale of the number of people who are supporting us versus the smaller number who are supporting Andrew Cuomo.”

The contribution cap for individuals is $2,100.

– Additional reporting by Zoe Hussain