Interactive Census Data

Great interactive chart from the NY Times that uses Google maps and data from the census.
You can look at incomes from the census track level (e.g. a few blocks) all the way up to the entire country. This diagram shows income distribution:
Income in Manhattan
And this one is the change in median income:
Income change
You can also check things like ethnicity and various income levels.

Population of the Five Boroughs

I saw a graph showing the population of the Five Boroughs: Manhattan, Bronx, Staten Island, Brooklyn, and Queens. I tracked the data to: NYC Population and NYC 2008 Population.
What I was surprised about is how the population of Manhattan has actually dropped over the years:
Of course, it’s density that matters! Here’s the population expressed as 1000 people per square mile
Wow! 72,000 people per square mile in Manhattan.