The hotel industry is booming in the United States in pretty much every way, except in one that might matter most to guests: staffing.

“This is the tightest labor market we’ve seen in a generation, at a time when demand for hotels has never been higher,” said Chip Rogers, president and chief executive of the American Hotel and Lodging Association .

More than 2,270 new hotels, motels, inns and bed-and-breakfasts were added over the past three years. That brings the number of properties in the United States to nearly 55,900, according to a report released Monday on the industry’s economic impact that was conducted by Oxford Economics on behalf of the A.H.L.A. Although the number of guest rooms rose to 5.3 million (not counting Airbnb, VRBO and other short-term rentals), there was a 66 percent occupancy rate — the highest since at least 2005, as far back as the survey looked.

While that’s good news for the lodging industry and the businesses associated with it, it also means that in a tight job market, hotel guests may find that things are not running as smoothly as they may like.