Here are a few other resources that may be helpful as you search for data. Collected here are a number of open-access data repositories, or places where researchers store their data.
The Illinois Data Bank allows public access to data published by researchers at the University of Illinois, Urbana-Champaign.
re3data (Registry of Research Data Repositories) provides a searchable and browsable list of data repositories covering multiple disciplines from all over the world.
A service of the Inter-university Consortium for Political and Social Research (ICPSR), openICPSR is a self-publishing repository for social, behavioral, and health sciences research data.