That's an average of 5.7 gadgets in each house.
The NPD Group reports that more than half a billion devices in US homes are connected to the web and deliver apps, with tablets and smartphones powering the surge to reach the milestone.
There's now an average of 5.7 devices per household, which is up from 5.3 devices just three months ago. The quarter saw the installed base of tablets and smartphones rise by 18 million and nine million respectively, while Apple and Samsung, of course, continue to dominate.
Despite the spike of mobile devices, however, PC penetration among American connected households is at 93 per cent, but that figure was pretty static for the quarter. Smartphones and tablets, meanwhile, increased from 52 per cent to 57 per cent and 35 per cent to 53 per cent respectively.
John Buffone, director of devices, NPD Connected Intelligence, said: "Even with this extraordinary growth in the smartphone and tablet market, PCs are still the most prevalent connected device in US internet households, and this is a fact that won't be changing any time soon.
"However, when you look at the combined number of smartphones and tablets consumers own, for the first time ever it exceeded the installed base of computers. It's hard to believe that tablets and smartphones are still somewhat in their infancy. But as we have seen in just the past few months, there is significant potential for this market to develop further."