The New York Times has a series of interactive maps of the US with which you can study population distribution by race and ethnicity, income, housing (such as mortgage, home value, and rent), and by education. I found that the average household income in my county in 2009 was $21,195, which is 10% less than in the year 2000. The data comes from the US Census Bureau. Link -via Metafilter
Don't forget about inflation! At an annualized rate of 3% it's actually only 74.4% of the quoted figure in today's worth.
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Needs adobe flash; doesn't work with gnash. :) Don't ream me with comments stating that adobe's flash is more secure than gnash.
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