More than 600 people have signed an online petition opposing the closure of the psychiatric ward at an Upper Manhattan hospital since The Post exclusively reported on the plan last week.

Dr. Beth Barron, an internist at the Allen Hospital in Inwood, said she started the change.org protest because “it really is now or never to prevent this from happening.”

“The psychiatric floor is really an amazing floor, staffed by incredibly dedicated and incredibly caring individuals…People really do get getter up there,” she said.

New York-Presbyterian is seeking state permission to “decertify” all 30 inpatient beds at the Allen Hospital to make room for a modernized maternity ward and four new operating rooms.

Community Board 12 last month voted 34-0 against the proposal, which is also opposed by a host of local elected officials.