| Pacific Research Institute: San Francisco-based public policy think tank promoting individual freedom and personal responsibility. |
| Palmetto Institute: A public policy organization dedicated to creating a business, political and educational environment that increases the personal wealth of every citizen of South Carolina as measured by per capita income. |
| Pioneer Institute: A Boston-based public policy research institute advocating individual freedom and responsibility, limited and accountable government, and expanded application of free-market principles. |
| Policy Development: Policy Development brings the first-hand experience of direct service organizations to high-level policy debate, while bringing greater policy awareness to direct service program planning. |
| Political Research Associates: Monitors and analyzes the organizations, leaders, ideas, and activities of the US political right. |
| Progressive Policy Institute: A public policy center shaping the "Third Way" governing agenda. |
| Project California: A 501(c)(4) nonprofit organization that brings together recognized experts, opinion leaders, and everyday Californians to develop and explore fresh, innovative solutions to the challenges facing our state in the coming decades. |
| Public Interest Institute: A non-profit, non-partisan, public policy research organization located on the campus of Iowa Wesleyan College in Mt. Pleasant, Iowa. The Institute promotes the importance of a free-enterprise economic system and limited government in society based upon individual freedom and liberty. |
| Public Policy Forum: A nonpartisan public policy research organization and good government watchdog. |
| Public Policy Institute of California: A private, non profit organization dedicated to independent, nonpartisan research on California's economic, social, and political issues. |
| Public/Private Ventures: An action-based research, public policy and program development organization. Website features published reports on youth, labor market, community and faith-based initiatives, as well as program replication. |
| The Priorities Institute: Explores regional land use planning, sustainable, carfree city design, 21st century constitutions, holistic indexing |
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