The homeowner vacancy rate is the proportion of the homeowner inventory that is vacant for sale.
Source: US. Bureau of the Census
Release: Housing Vacancies and Homeownership
US. Bureau of the Census, Homeowner Vacancy Rate in the Midwest Census Region [RHVRMWQ156N], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/RHVRMWQ156N/, August 2, 2015.