The total of the second home stock in the U.S. was 7.5 million in 2014, up 8% from 2009, according to the estimates by National Association of Home Builders. But where are those second homes located? Citing the latest data from 2014 American Community Survey, NAHB economist Na Zhao pinpoints 10 counties where there are the largest share of second homes. Zhao writes,
"The county with the largest share of second homes is Hamilton County, NY with 79.3%, followed by Forest County (74%), PA, and Rich County (72.7%), UT. As one might expect, the top 10 counties with the largest share of second homes are mostly tourist destinations.
In-depth analysis, however, shows that the concentration of second homes is not simply restricted to conventional locations like beachfront areas. There were 913 counties spread over 49 states where second homes accounted for at least 10% of the local housing stock. Only Connecticut and Washington D.C. were exceptions. 357 counties, 11% of all counties in the U.S., had at least 20% of housing units that were second homes.
27 counties in 14 states had over half of housing units qualified as second homes. Of these counties, five counties are in Michigan, four in Colorado and Wisconsin, two in California, Massachusetts, Pennsylvania, Utah, and one county each in Idaho, Missouri, North Carolina, New Jersey, New Mexico, and New York."