Four of New York City’s five boroughs have lost a higher percentage of residents since COVID than any of the 40 largest counties in the country, a startling new review of US Census data shows. Topping the list is The Bronx — with a 7.2% drop in the past three years, according to the analysis of county-level population estimates. “It’s been good for us — we get more work — but it’s sad,” said Manny Gomez, a 42-year-old Bronx resident and employee of Morgan and Brothers Manhattan, a storage and moving company, in the borough’s Mount Eden section.