City parks are getting alarmingly packed with New Yorkers looking for some fresh air and exercise while on coronavirus lockdown. So some are turning to a far more morbid destination: cemeteries.

“You can walk for hours and barely see another person,” says Molly Cusick, 31, a book editor who visited Green-Wood Cemetery in Brooklyn last weekend.

She and her husband checked out Prospect Park, but the sight of so many other people had them worried about spreading the disease.

“With the virus, we wanted to go somewhere quiet and less stressful, so the cemetery felt like a better option than Prospect Park,” she tells The Post. “You don’t have to worry about passing other people and staying 6 feet apart. It’s much more relaxing.”

“600,000 souls and not a one from which we must socially distance,” Cusick wrote on Instagram.

“I’ve had some friends tell me they think it’s weird or depressing to go to the cemetery right now,” Cusick tells The Post, adding that she visits Green-Wood often because of its close proximity to her Windsor Terrace apartment. “I look at the cemetery as a sort of restful, rejuvenating place.”

Other New Yorkers have also felt the draw of cemeteries, despite grim reports of death all around them.

“Social distancing — six feet under. Feels safe,” writes @glenn_electric on Instagram.

“And now…your daily dose of social distancing spring,” wrote @mways.

“I wore a mask and changed course anytime I saw a person in the distance, which was rarely,” wrote @sklarchemmamy.

At Brooklyn’s Green-Wood Cemetery, there are 478 acres of open space and more than 7,000 trees (the magnolias are currently in full bloom) which has made the National Historic Landmark a popular spot for a spring walk — away from the living. Although public programs have been canceled, the main entrance and grounds remain open daily — explicitly for those looking for an escape from the tragic coronavirus news.

“We recognize the role Green-Wood plays in so many lives, not just as a place of remembrance, but one of solace in an ever-uncertain world,” said Green-Wood President Richard J. Moylan in a statement on the graveyard’s website. “Therefore we are dedicated to stay open and accessible during this time so you may continue to find peace in our landscape — as generations before us have.”

Other popular cemeteries remain open as well, like the lush grounds of the 113-acre Moravian Cemetery on Staten Island (the office, however, is closed).

At some graveyards, the dead really are resting in peace. Calvary Cemetery, with its 365 acres and more than 3 million interments, has closed its grounds to visitors. Evergreens Cemetery in Brooklyn also closed its gates to the living last week.