2.3m American households own a virtual reality headset

"Parks Associates announced new consumer research today showing that 2% of U.S. broadband households, or 2.3 million households, own a virtual reality headset. The research firm will host CONNECTIONS™: The Premier Connected Home Conference May 24-26 in San Francisco, where its analysts will discuss findings from 360 View: CE Adoption and Trends, a survey of 10,000 U.S. broadband households, which reveals 5% of U.S. broadband households plan to buy a VR headset in 2016, an increase from only 1% who made a purchase the year prior."

Source:  Parks Associates, 16th May 2016

Note - This figure seems high, until you realised that it includes Google Cardboard.