This is a list of think tanks in the United States.[1]
| Name | Location | Bias/Affiliation | Founded Date |
|---|---|---|---|
| Acton Institute | Grand Rapids, MI | Conservative/Libertarian | 1990 |
| Allegheny Institute for Public Policy | Pittsburgh, PA | Conservative | 1995 |
| American Action Forum | Washington, D.C. | Conservative | 2009 |
| American Civil Rights Union | Alexandria, VA | Conservative | 1998 |
| American College of Pediatricians | Gainesville, FL | Socially Conservative | 2002 |
| American Enterprise Institute | Washington, D.C. | Center-Right | 1938 |
| American Institute for Economic Research | Great Barrington, MA | Conservative/Libertarian | 1933 |
| Atlas Network | Arlington, VA | Conservative/Libertarian | 1981 |
| Ayn Rand Institute | Santa Ana, CA | Center-Right/Libertarian | 1985 |
| Beacon Center of Tennessee | Nashville, TN | Free-Market/Libertarian | 2004 |
| Beacon Hill Institute | Medway, MA | Free-Market/Libertarian | 1991 |
| Berggruen Institute | Los Angeles, CA | Liberal | 2010 |
| Bipartisan Policy Center | Washington, D.C. | Bipartisan | 2007 |
| Brookings Institution | Washington, D.C. | Nonpartisan | 1916 |
| Buckeye Institute | Columbus, OH | Free-Market | 1989 |
| Caesar Rodney Institute | Newark, DE | Right-Wing | 2008 |
| Carnegie Endowment for International Peace | Washington, D.C. | Nonpartisan | 1910 |
| Cascade Policy Institute | Portland, OR | Libertarian | 1991 |
| Cato Institute | Washington, D.C. | Libertarian | 1977 |
| Center for a Just Society* | Washington, D.C. | Conservative | 2004 |
| Center for American Progress | Washington, D.C. | Liberal | 2003 |
| Center for Automotive Research | Ann Arbor, MI | Nonpartisan | 2003 |
| Center for Development and Strategy | Buffalo, NY | Nonpartisan | 2014 |
| Center for Economic and Policy Research | Washington, D.C. | Left-leaning | 1999 |
| Center for Freedom and Prosperity | Alexandria, VA | Conservative | |
| Center for Governmental Research | Rochester, NY | Nonpartisan | 1915 |
| Center for Immigration Studies | Washington, D.C. | Right-wing | 1986 |
| Center for Media and Democracy | Madison, WI | Progressive | 1993 |
| Center for National Policy | Washington, D.C. | Center | 1981 |
| Center for Public Integrity | Washington, D.C. | Independent | 1989 |
| Center for Public Justice | Washington, D.C. | Christian | 1977 |
| Center for Strategic and Budgetary Assessments | Washington, D.C. | Independent | 1983 |
| Center for the Study of the Presidency and Congress | Washington, D.C. | Nonpartisan | 1965 |
| Center on Budget and Policy Priorities | Washington, D.C. | Progressive | 1983 |
| Claremont Institute | Claremont, CA | Conservative | 1979 |
| Committee for a Responsible Federal Budget | Washington, D.C. | Nonpartisan | 1981 |
| Committee for Economic Development | New York, NY | Nonpartisan | 1942 |
| Competitive Enterprise Institute | Washington, D.C. | Libertarian | 1984 |
| Concord Coalition | Arlington, VA | Nonpartisan | 1992 |
| Constitution Project | Washington, D.C. | Bipartisan | 1997 |
| Council on Competitiveness | Washington, D.C. | Nonpartisan | 1986 |
| Demos | New York, NY | Liberal | 2000 |
| Drum Major Institute | New York, NY | Progressive | 1961 |
| Economic Opportunity Institute | Seattle, WA | Liberal | 1998 |
| Economic Policy Institute | Washington, D.C. | Left-leaning | 1986 |
| Employment Policies Institute | Washington, D.C. | Conservative | 1991 |
| Eno Center for Transportation | Washington, D.C. | Nonpartisan | 1921 |
| Every Texan | Austin, TX | Nonpartisan | 1985 |
| Federation for American Immigration Reform | Washington, D.C. | Right-wing | 1979 |
| Florida Institute for Sustainable Energy | Gainesville, FL | Nonpartisan | |
| Foundation for Economic Education | Atlanta, GA | Conservative/Libertarian | 1946 |
| Future of American Democracy Foundation | Nonpartisan | ||
| Goldwater Institute | Phoenix, AZ | Conservative/Libertarian | 1988 |
| Group of Thirty | Washington, D.C. | Free-Market | 1978 |
| Guttmacher Institute | New York, NY | Liberal | 1968 |
| Hispanic American Center for Economic Research | Washington, D.C. | Center-Right | 1996 |
| Hoover Institution | Stanford, CA | Free-Market/Libertarian | 1919 |
| Hudson Institute | Washington, D.C. | Conservative | 1961 |
| Idaho Freedom Foundation | Boise, Idaho | Conservative/Libertarian | 2009 |
| Independence Institute | Denver, CO | Libertarian | 1985 |
| Independent California Institute | Carlsbad, CA | Independent | 2018 |
| Institute for New Economic Thinking | New York, NY | Liberal | 2009 |
| Institute for Policy Studies | Washington, D.C. | Progressive | 1963 |
| Institute for Women's Policy Research | Washington, D.C. | Progressive | 1987 |
| Institute on Religion and Democracy | Washington, D.C. | Conservative/Christian | 1981 |
| Institute on Taxation and Economic Policy | Washington, D.C. | Liberal | 1980 |
| International Food Policy Research Institute | Washington, D.C. | Nonpartisan | 1975 |
| James A. Baker III Institute for Public Policy | Houston, TX | Nonpartisan | 1993 |
| James Madison Institute | Tallahassee, FL | Free-Market | 1987 |
| John S. Watson Institute for Public Policy | Union, NJ | Nonpartisan | |
| Joint Center for Political and Economic Studies | Washington, D.C. | Nonpartisan | 1970 |
| Kansas Policy Institute | Wichita, KS | Free-Market | 1996 |
| Levy Economics Institute | New York, NY | Nonpartisan | 1986 |
| Lexington Institute | Arlington, VA | Center-Right | 1998 |
| Lincoln Institute of Land Policy | Cambridge, MA | Nonpartisan | 1946 |
| Lugar Center | Washington, D.C. | Bipartisan | |
| Mackinac Center for Public Policy | Midland, MI | Free-Market | 1987 |
| Maine Policy Institute | Portland, ME | Free-Market | 2002 |
| Manhattan Institute for Policy Research | New York, NY | Conservative | 1978 |
| MassINC | Boston, MA | Nonpartisan | 1995 |
| McCain Institute | Washington, D.C. | Center-Right | 2012 |
| Mercatus Center | Arlington, VA | Free-Market/Libertarian | 1980 |
| Migration Policy Institute | Washington, D.C. | Center-Left | 2001 |
| Milken Institute | Santa Monica, CA | Independent | 1991 |
| Mises Institute | Auburn, AL | Free-Market/Libertarian | 1982 |
| National Association of Scholars | New York, NY | Conservative | 1987 |
| National Bureau of Asian Research | Seattle, WA | Nonpartisan | 1989 |
| National Bureau of Economic Research | Cambridge, MA | Center-Right | 1920 |
| National Center for Policy Analysis | Dallas, TX | Free-Market/Libertarian | 1983 |
| National Endowment for Democracy | Washington, D.C. | Free-Market | 1983 |
| National Policy Institute | Alexandria, VA | Right-Wing, Extremist | 2005 |
| New America | Washington, D.C. | Center-Left | 1999 |
| New Democrat Network | Washington, D.C. | Center | 1996 |
| Niskanen Center | Washington, D.C. | Liberal | 2015 |
| Oklahoma Policy Institute | Tulsa, OK | Nonpartisan | 2008 |
| Oregon Center for Public Policy | Portland, OR | Nonpartisan | 1995 |
| Pacific Research Institute | Pasadena, CA | Free-Market/Libertarian | 1979 |
| Pembroke Center for Teaching and Research on Women | Providence, RI | Nonpartisan | 1981 |
| People's Policy Project | Washington, D.C. | Left-leaning | 2017 |
| Peterson Institute for International Economics | Washington, D.C. | Nonpartisan | 1981 |
| Pew Research Center | Washington, D.C. | Nonpartisan | 2004 |
| Philadelphia Society | Grand rapids, MI | Conservative/Libertarian | 1964 |
| Pioneer Institute | Boston, MA | Free-Market | 1988 |
| Policy Matters Ohio | Cleveland, OH | Progressive | 2000 |
| Population Research Institute | Front Royal, VA | 1989 | |
| Potomac Institute for Policy Studies | Arlington, VA | Independent | 1994 |
| Progressive Policy Institute | Washington, D.C. | Center-Left | 1989 |
| Prosperity Now | Washington, D.C. | Center-Left | 1979 |
| Public Citizen | Washington, D.C. | Progressive | 1971 |
| Public Policy Institute of California | San Francisco, CA | Independent | 1994 |
| R Street Institute | Washington, D.C. | Center-Right | 2012 |
| RAND Corporation | Santa Monica, CA | Nonpartisan | 1948 |
| Reason Foundation | Los Angeles, CA | Libertarian | 1978 |
| Ripon Society | Washington, D.C. | Conservative | 1962 |
| RMI | Basalt, CO | Nonpartisan | 1982 |
| Rockefeller Institute of Government | Albany, NY | Nonpartisan | 1981 |
| Rockford Institute | Rockford, IL | Conservative | 1976 |
| Rockridge Institute | Berkeley, CA | Progressive | 1997 |
| Roosevelt Institute | New York, NY | Liberal | 1987 |
| Seven Pillars Institute | Kansas City, MO | Nonpartisan | 2010 |
| Show-Me Institute | St. Louis, MO | Free-Market | 2014 |
| Social Science Research Council | Brooklyn, NY | Independent | 1923 |
| SRI International | Menlo Park, CA | Nonpartisan | 1946 |
| Sunwater Institute | North Bethesda, MD | Nonpartisan | 2017 |
| Tax Foundation | New York, NY | Center | 1937 |
| Texas Public Policy Foundation | Austin, TX | Conservative | 1989 |
| The Century Foundation | New York, NY | Progressive | 1919 |
| The Conference Board | New York, NY | Nonpartisan | 1916 |
| The Gravel Institute | New York, NY | Left-leaning | 2020 |
| The Harkin Institute for Public Policy & Citizen Engagement | Des Moines, IA | Nonpartisan | 2013 |
| The Heartland Institute | Arlington Heights, IL | Conservative/Libertarian | 1984 |
| The Heritage Foundation | Washington, D.C. | Conservative | 1973 |
| The Independent Institute | Oakland, CA | Libertarian | 1986 |
| The Reform Institute | Alexandria, VA | Center | 2001 |
| Third Way | Washington, D.C. | Center-Left | 2005 |
| Thomas B. Fordham Institute | Washington, D.C. | Conservative | 2007 |
| Urban Institute | Washington, D.C. | Liberal | 1968 |
| W. E. Upjohn Institute for Employment Research | Kalamazoo, MI | Nonpartisan | 1945 |
| Washington Policy Center | Seattle, WA | Nonpartisan | |
| Yankee Institute for Public Policy | Hartford, CT | Conservative | 1984 |
