Bookings at Trump hotels in Washington, DC, and New York — which plunged during Donald Trump’s presidential campaign — have spiked since his victory.

The Trump International Hotel Washington, DC, just blocks from the White House, has seen a 20 percent increase in reservations and is sold out for Inauguration Day weekend in January.

“Wow. Demand is definitely up,” said Jack Ezon, president of Manhattan-based travel agency Ovation Vacations. “I didn’t expect it to happen so quickly.”

Bookings at the Trump International Hotel & Tower New York are up 18 percent since Election Day, and there has been a 15 percent rise at the Trump Soho New York, Ezon told The Post.

A check on the Expedia travel site Thursday showed the Trump New York was sold out for Friday night, while similarly priced hotels, like The Plaza and The Mark, had vacancies. Rooms were available at the Trump Soho for about $500.

But reservations at other Trump-branded hotel and resorts remained virtually unchanged.

“Toronto is up 2.5 percent and Chicago is up 1 percent, which is not significant,” Ezon said.

Calls to the hotels for comment were referred to the head office in New York, and reporters were given the old number to Trump’s campaign headquarters.

“We have been instructed to refer all calls to New York,” said a front-desk worker at the Trump International Hotel & Tower Toronto.

Business for the hotels fell by about 30 percent during Trump’s campaign. Ezon predicts opinion polls will continue to affect the rates and popularity of the brand.

“If people are thrilled, bookings will go up, if people are angry, they’ll go down. What he does definitely affects the numbers,” he said.

Lodging at the Trump Washington, DC, in the historic Old Post Office Pavilion, had been wide open since its Sept. 12 opening, but rooms were being snapped up Thursday and were sold out for Jan. 20, when Trump is scheduled to be sworn in.