Source: US. Bureau of the Census
Release: Housing Vacancies and Homeownership
The rental vacancy rate is the proportion of the rental inventory that is vacant for rent.
US. Bureau of the Census, Rental Vacancy Rate for the United States [RRVRUSQ156N], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/RRVRUSQ156N, July 30, 2016.