Nate Silver at FiveThirtyEight put up this graph of U.S. household debt (from the 2007 Survey of Consumer Finances):

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Silver says,

Per-family household debt increased by about 130% in real dollars between 1989 and 2007, from roughly $42,000 per family in 1989 to $97,000 eighteen years later. Most of that increase has come during the past six or seven years — household debt increased by 52% between 2001 and 2007 alone. Almost all of the debt (about 85%) falls into the category that the Fed calls “secured by residential property” — which means mortgages and home-equity loans.

Some other images from the SCF Chartbook (available here)–and pay attention to the y axis, since the scale isn’t the same in all of them:

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This next one is for rural (non-MSA) and urban (MSA) areas:

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The Chartbook has images of the mean values for all these calculations as well, I just prefer the median to reduce the effects of outlier incomes.