12% of American households own an Apple computer, up from 9% in 2008

"According to leading market research company The NPD Group’s 2009 Household Penetration Study, approximately 12 percent of all U.S. computer owning households own an Apple computer, up from 9 percent in 2008. While Apple ownership is growing, those households are decidedly in favor of mixed system environments. Of those 12 percent, nearly 85 percent also own a Windows-based PC.
Multiple computer ownership is a common thread in Apple computer households, with 66 percent of households owning three or more computers, compared to just 29 percent of Windows PC households.
Apple owning households are decidedly more mobile as well, with 72 percent of them owning a notebook, whereas only 50 percent of households that have a Windows PC own a notebook.
Not only do Apple computer owners own more computers (and more mobile computers) than the norm they also tend to own more types of electronics, and more of them, than typical computer owning households. For example, while 36 percent of total computer owning households have an iPod, 63 percent of Apple households have one. And while almost 50 percent of Apple owners own some type of navigation system, only about 30 percent of all computer households own one."
Source: Press release from NPD Group, 5th October 2009