Vacant properties have increased 43.8 percent in the U.S. since 2000, according to the Census Bureau.
CNBC reported recently there were 14.3 million year-round vacant housing units in the country, with a 10.6 percent gross vacancy rate.
Orlando, Fla., had the highest rental vacancy rate, at 18.8 percent, according to the report. Dayton, Ohio, had the highest homeowner vacancy rate on the list, as 5.4 percent of homes there were unoccupied.
Vacant homes are defined as either unoccupied rentals or homes that are unoccupied and for sale. Looking at vacancies is important for real estate investors seeking to identify housing trends.
Listed below are the 10 U.S. cities with the most vacancies. These cities were ranked by 12-month averages of rental vacancy rates and homeowner vacancy rates.