According to telephone survey data (n=2,252) released this morning by The Pew Internet & Life Project, 34% of US adults now own tablets. What that means as a practical matter is: 81 million adults. There may also be 20 million more people in the US under 18 who own tablets. (Our house has four.)
I think it's relatively safe to say that if the number of tablets in the US isn't yet 100 million it's extremely close.
A large majority of tablet owners are substituting tablets for PC usage in many instances and either buying fewer PCs overall or delaying PC replacement for a much longer period. This morning Apple will open its developer conference. A upgraded iPad/Mini is not expected to be among the announcements but it's possible.
As with other device categories, the story is largely the same with tablets. Penetration rates are higher among college educated (49%) and more affluent adults (56%). Affluent means at least $75,000 in income.
The chart above reflects the growth of tablets since 2010 when only 3% reported tablet ownership. It's possible that by Q4 of 2014 half of the US adult population will have tablets (and 75% of affluents).
Global tablet shipments this year are expected to exceed those of laptop computers according to IDC. IDC also argues most of those sales will be at the lower end of the market (size, price).
Last week both Pew and Nielsen reported that 61% of mobile subscribers now own smartphones.