A Westchester County couple disappeared while on vacation in the Dominican Republic last month, and now their family and friends are frantic.

Orlando Moore, 43, and girlfriend Portia Ravenelle, 32, of Mount Vernon, were supposed to fly home from their four-day trip on March 27 — but they never made it to the airport.

“I’m very worried,’’ Moore’s aunt told The Post on Monday.

“I am hoping that somewhere they’re being held against their will and they’re alive. But as time goes by, we start thinking that something strange has happened,” said the relative, who asked to remain anonymous.

Ravenelle’s mom added, “Of course, I’m worried. Authorities are working on it. I don’t know anything.’’

Moore and Ravenelle had checked out of their hotel at the Grand Bahia Principe Cayacoa in the northeast town of Samana, but their rental car was never returned to the airport, and their phones are turned off.

Their social media pages also went dark after they had been posting photos of themselves doing typical touristy things, such as riding horses, there.

Moore has two children and is a mailman, according to a friend, while a neighbor said Ravenelle has three kids.

The neighbor, John Hollis, said he exchanged general text messages with Moore regarding Moore’s home the Sunday before the couple went missing.

Moore then FaceTimed Hollis the morning he disappeared, the neighbor said. “He said in a video call he’d be returning that same day. I haven’t heard from him since,’’ Hollis said, adding that Ravenelle “is a dear friend of mine . . . very responsible.’’

Mount Vernon police said they are aware of the situation but were not involved in the investigation.

A US State Department rep told The Post, “We stand ready to provide appropriate assistance to US citizens in need and to their families.

When anyone is “missing, we work closely with local authorities as they carry out their search efforts and share information with families” but “due to privacy” concerns, “no further information” was available, the rep added.