Nearly 90% of American internet homes have broadband

"New consumer research from Leichtman Research Group, Inc. (LRG) found that nearly 90% of US households that use a laptop or desktop computer at home currently subscribe to a broadband Internet service. Five years ago, 65% of households with a computer subscribed to a broadband service.
LRG's research also found that higher-income households are much more likely than lower income households to use computers at home, and to subscribe to residential broadband services"

Source:  Press release from Leichtman Research, 4th September 2012