More than 16 million homes are sitting vacant across the U.S., according to a report using census data. The study by LendingTree ranked the nation’s 50 states by their shares of unoccupied homes. The highest vacancy rates were found in Vermont, Maine and Alaska. Each state has between 20% and 22% of its housing stock vacant. The three states combined are home to more than 315,000 unoccupied units. Other states rank lower on the list but have many more vacant units because they are larger. Florida, for example, is No. 6 on the list. About 17% of states in Florida...