CIESE Real Time Population Growth Data Project
http://www.k12science.org/curriculum/popgrowthproj/
http://www.k12science2.org/curriculum/popgrowthproj/
(mirror site)
Here you can find the source for this project, and all of the activities required of the students.
US Census data
http://www.census.gov
/
Students will use data from the US census website for this project.