Internet use is so ubiquitous that many Americans take it for granted. But a shockingly large number of America's poorest households live without it.

More than 80 percent of American households owned a computer and just shy of 75 percent had an Internet subscription in 2013, according to a new report by  the U.S. Census Bureau based on the American Community Survey. 

There are some pretty clear demographic trends among who is most up to speed with the digital times, the Census Bureau found.

Household computer ownership and Internet use were most common in homes with relatively young householders, in households with Asian or White householders, in households with high incomes, in metropolitan areas, and in homes where householders received relatively high levels of educational attainment.

Income was among the most important factors for whether or not Americans had access to the Internet at home.

Nearly 95 percent of households bringing in $150,000 or more per year lived in homes where someone had some sort of an Internet subscription. But less than half of U.S. households making less than $25,000 per year did. The Internet-income gap is even larger than the Internet age-gap, but was roughly on par with the gap related to educational attainment. Only 43.8 percent of householders with less than a high school degree lived in homes with Internet access versus more than 90 percent of householders with at least a bachelor's degree.

The vast majority of connected households now have broadband connections. Cable modems were by far the most common type of Internet subscription, with 42.8 percent of households, while roughly a third of households rely on mobile broadband subscriptions.

Just 1 percent of households were still using dial-up. (Perhaps, these are the straggling AOL dial-up subscribers?)

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