Where have you gone, Bill de Blasio?

People in the Big Apple — which has over eight million residents, making it the country’s largest metropolis — can’t seem to find you.

That’s the feeling of those who started a “missing in action” campaign against the mayor, given his frequent absences in New York City as he travels across the country in a longshot attempt to become the 2020 Democratic nominee.

“A snide critic” has launched a new campaign against the jet-setting mayor, as The New York Post reported — and one of its taglines is this: ‘de Blasio for Resident.”

Related: Poll Reveals New Yorkers Like Trump More Than They Do de Blasio

“Missing” posters — in stark black-and-white and carrying the mayor’s age, height and weight — have been cropping up all across midtown Manhattan “jokingly seeking tips on the whereabouts of Mayor de Blasio as he pursues the presidency,” the publication also noted.

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One poster with a picture of the mayor has this snarky message: “Last seen embarrassing himself in Iowa, New Hampshire and South Carolina. If seen please tell him to immediately return to New York and do the job he was elected to do.”

It then urges people to reach out and contact “[email protected].”

The man who created the posters gave his name as Jason Servig to The Post.

Servig wants de Blasio to drop out of the race immediately — and head back to take care of New York City’s business.

He also told The Post he wants the mayor “to apologize to New Yorkers on live television [during Sunday night’s CNN town hall] for the embarrassment he has caused to the city with his disastrous campaign.”

The mayor is “trailing badly in the polls and in fundraising for 2020,” The New York Times noted two days ago.

Here’s how an opinion piece in The New York Daily News put it ahead of the Sunday night town hall with de Blasio: “It looks like Bill de Blasio, nowhere at all in the national polls but looking happier eating corndogs in Iowa (ugh!) or grinning uncontrollably while spending an hour with Sean Hannity (UGH!) than he does doing his day job, is about done serving as mayor of New York City, and that we’re set for a couple more years on autopilot — assuming no crash — before an actual leader can take the wheel.”

The man behind the “missing” posters wants de Blasio to drop out of the race immediately — and head back to take care of New York City’s business.

“With virtually no fundraising support for his national campaign outside a handful of groups here (hotel developers, members of politically wired unions, Orthodox Jews) who expect consideration from City Hall in exchange, there’s little chance de Blasio even makes the next debate,” the Daily News opinion piece went on. “His CNN town hall [on] Sunday night looks a lot like the end of the road as his fellow also-rans start exiting the race.”

Former Colorado Gov. John Hickenlooper, Washington Gov. Jay Inslee, and Rep. Seth Moulton of Massachusetts all have dropped out of the race recently — as did Rep. Eric Swalwell of California in early July.

Hickenlooper said he intends to run for a Senate seat now.

The next Democratic debate will be held in late September in Houston.

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