The private conservancies that supplement budgets for some of New York City's public parks would need to disclose more about their finances under a bill passed unanimously Thursday by the City Council.

By a vote of 51-0, the council voted to require the nonprofit conservancies benefiting such spaces as Central Park and Prospect Park to disclose such details as how much money each park is receiving.

Bill sponsor Councilman Mark Levine (D-Manhattan) said the city's interpretation of existing disclosure laws did not give the public sufficient information.

For example, the Central Park Conservancy -- which couldn't be reached for comment -- reported allocating funds of about $175,000 last year, according to a spreadsheet provided by Levine's office. Levine said his office believes it was in excess of $40 million, Levine's office said.

"You had absurd, absurd numbers," Levine said.

The High Line will now be included; it wasn't under past legislation, because of a reporting quirk.

The bill awaits Mayor Bill de Blasio's signature. His press office didn't return a call asking whether he would sign it.