According to data provided by the US Postal Service, residential vacancies have increased by 1,502 from January 2014 to March 2014. From September 2013 to March 2014 vacancies increased by over 2,000. According to USPS, they determine that a residency is vacant if an occupant has not collected their mail for 90 days are more.

The Center for Urban Studies creates a data base with this information and it provides a more in-depth look at the vacancies. The USPS publicly releases the vacancy data on a quarterly basis; this is possible through an agreement with the U.S. Department of Housing and Urban Development.