Former Democratic New Jersey Gov. Jim McGreevey will announce his political comeback next Thursday, when he’ll publicly declare that he’s running for mayor of Jersey City, a member of his campaign staff told The Post. 

McGreevey, 66, has been out of politics for nearly 20 years, ever since his 2004 resignation from the Garden State governorship after coming clean about a secret extramarital affair with a male staffer. 

The former governor’s opportunity to re-enter politics opened in April, when his hometown mayor, Steven Fulop, announced that he wouldn’t seek re-election in Jersey City and would instead run to replace term-limited Democratic Gov. Phil Murphy in 2025.

“Thursday’s D-Day for the McGreevey for mayor campaign,” McGreevey told The Post on Friday. 

The former governor has already filed his paperwork with the New Jersey Election Law Enforcement Commission and plans to launch his campaign on Nov. 9, during an event at a Dominican restaurant in Jersey City at 9 a.m.

He’ll be joined at the campaign kick-off by his sister, Sharon, and his daughter, Jacqueline.

“It is a day when we will begin to bring the change we need to Jersey City: to work for greater accountability, reliable services, clean and safe streets, and controlled property taxes for working families,” McGreevey writes in an invitation for the event. 

“We must work harder and smarter for the residents and community of our Jersey City,” he adds, teasing his “Change We Need” campaign slogan. 

The campaign staffer added that McGreevey will focus on “nuts and bolts issues,” such as safe and clean streets, property taxes, apprenticeship programs for high school youth, government transparency and making sure that traffic flows smoothly in the city of nearly 300,000. 

McGreevey, who since leaving the governorship has received a divinity degree at General Theological Seminary in New York City and spent several years as executive director of Jersey City’s Employment & Training Program, appears to be the first candidate entering the race to replace Fulop. 

The non-partisan municipal election will take place in November 2025. 

McGreevey, a then married father of two, stunned the nation in August 2004 when he admitted to the affair.  

“My truth is that I am a gay American,” McGreevey said during a news conference. “I engaged in an adult consensual affair with another man, which violates my bonds of matrimony.”

Then-McGreevey aides said the man, Golan Cipel, tried to blackmail McGreevey for up to $5 million.

Cipel dropped a sexual harassment suit against McGreevey after his resignation.