Geowalk is a “mashup” that allows you to get demographic data, and a whole lot more, about different places in the world. It’s a helpful site for my students to use when they do their neighborhood comparison project because it has demographic data by zipcode (even though the statistics are a little old).
I’ve placed the link on my website under Student Neighborhood Maps.
Speaking of neighborhood data, I recently discovered through using the great site Mapdango (which I’ve posted about it in the past) that Wikipedia seems to have pages on many U.S. neighborhoods by zipcode. I typed in our school’s zipcode on Mapdango and saw a link to Wikipedia. I was then surprised to not only find a bunch of demographic data about the area, but also a well-written history.