20. RAND Corporation – A nonprofit global policy think tank that conducts research on various policy issues.
21. Urban Institute – A nonprofit organization conducting research on social and economic policy issues.
22. Pew Research Center – A nonpartisan think tank that conducts research on various issues, including social and demographic trends.
23. Kaiser Family Foundation – A nonprofit organization that conducts research on healthcare issues.
24. Guttmacher Institute – A nonprofit organization focused on sexual and reproductive health research.
25. Brookings Institution – A think tank that conducts research on economic and policy issues.
Please note that the availability of H1B sponsorship can change over time, and it’s essential to verify the current status with the respective organizations and the USCIS. Additionally, there are many other nonprofit research organizations in the United States, and this list is not exhaustive.