I've learned a lot of things about my family from Census records, so I was really appreciative to see this on CNN.com today:
What Census Records Can Teach Us
For starters, I learned with whom and where one of my Father's Sisters was raised in the 1930's, and the name of my paternal grandmother.
I learned one of my ancestors was boarding with a family in the 1880 Census.
What have you learned about your ancestors from Census records?