Many think tanks (non-profit, advocacy-oriented research organizations) provide access to research data. Use the following list from Wikipedia to discover think tanks focused on issues related to your research subject.
The home of the U.S. Government’s open data. Tools and resources to conduct research, develop web and mobile applications, design data visualizations, and more.
Federal government website dedicated to making high value health data more accessible to entrepreneurs, researchers, and policy makers in the hopes of better health outcomes for all.