More than two dozen people will be charged Tuesday in a scheme that flooded the city with fake placards that let motorists illegally park their cars, The Post has learned.

About 30 people are named in sealed indictments that will be handed up in Manhattan Supreme Court, sources said Monday.

Several suspects were arrested and were being held pending arraignment, while about 22 were scheduled to voluntarily surrender, sources said.

The placards they allegedly made and used are modeled on those that let law-enforcement officials skirt parking regulations, sources said.

The charges will include allegations of impersonation and forgery, sources said. It was unclear how much jail time the suspects face, but sources said each one was named in a separate indictment.

The grand jury action was the result of a joint investigation by the city Department of Investigation and the Manhattan District Attorney’s Office, sources said. Both agencies declined to comment.

In May, Mayor de Blasio announced a major crackdown on the abuse of official parking placards, saying the problem was “contributing to traffic congestion” and “starting to erode faith in the integrity of government.”

As part of the initiative, de Blasio said he was hiring 100 additional traffic enforcement agents and creating a 16-member “anti-placard fraud unit.”

More than 160,000 legitimate placards have been issued to cops, FBI agents, teachers, people with disabilities and others, the mayor said at the time.

Since the start of the crackdown, The Post has exposed several pols abusing their placards, including state Assemblyman Mark Gjonaj (D-Bronx).

In July, an expired placard issued to Gjonaj, who’s running for a seat on the City Council, was slapped on the dashboard of a campaign bus parked at an unpaid meter — even though the placard was assigned to a different vehicle.

In August, Assemblywoman Diana Richardson (D-Brooklyn) illegally parked her car in a driving lane outside her district office — then tried to publicly shame the rookie traffic agent who slapped her with a $115 ticket. Assembly placards expressly prohibit their use for “obstructing traffic.”

Additional reporting by Carl Campanile