Company lists · Data refreshed September 2026

Top 25 Think tanks and policy research based in the United States

Name: Think tanks and policy research based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 224 companies tracked

RevenueBase identified 224 think tanks and policy research headquartered in the United States as of September 2026 and tracks 11,974 professional contacts across them, including 4,347 with verified work emails. Washington is the largest hub.

This list covers think tanks and policy research headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 22, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 22, 2026 86% judged on-target in blind review

224Companies

11,974Contacts tracked

4,347Verified emails

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The 25 largest think tanks and policy research based in the United States

Ranked by team size

Top 25 of 224 think tanks and policy research based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to think tanks and policy research: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	RAND	Partial evidence	Santa Monica, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,660 contacts →
	Partial evidence “RAND is a nonprofit, nonpartisan research organization that provides leaders with the information they need to make evidence-based decisions.” Source: RevenueBase Database · checked Sep 22, 2026
2	Center For Strategic And International Studies Csis	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	201-500	937 contacts →
	Strong evidence “The Center for Strategic and International Studies (CSIS) is a bipartisan, nonprofit policy research organization dedicated to advancing practical ideas to address the world’s…” Source: RevenueBase Database · checked Sep 22, 2026
3	American Enterprise Institute	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	n/a	770 contacts →
	Strong evidence “Who we are: The American Enterprise Institute is a public policy think tank dedicated to defending human dignity, expanding human potential, and building a freer and safer world.” Source: RevenueBase Database · checked Sep 22, 2026
4	The Heritage Foundation	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	201-500	695 contacts →
	Strong evidence “Founded in 1973, The Heritage Foundation is a research and educational institution-a think tank-whose mission is to formulate and promote conservative public policies based on the…” Source: RevenueBase Database · checked Sep 22, 2026
5	Carnegie Endowment For International Peace	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	311 contacts →
	Indirect evidence “The Carnegie Endowment for International Peace generates strategic ideas and independent analysis, supports diplomacy, and trains the next generation of scholar-practitioners to…” Source: RevenueBase Database · checked Sep 22, 2026
6	The Stimson Center	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	243 contacts →
	Strong evidence “The Stimson Center promotes international security and shared prosperity through applied research and independent analysis, global engagement, and policy innovation.” Source: RevenueBase Database · checked Sep 22, 2026
7	PEW Research Center	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	237 contacts →
	Partial evidence “Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping the world.” Source: RevenueBase Database · checked Sep 22, 2026
8	Hudson Institute	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	222 contacts →
	Strong evidence “Hudson Institute is a research-focused public policy think tank headquartered in Washington, DC, dedicated to promoting American leadership for a secure, free, and prosperous…” Source: RevenueBase Database · checked Sep 22, 2026
9	Capita	Partial evidence	Greenville, SC, United StatesHQ checked Sep 22, 2026	n/a	170 contacts →
	Partial evidence “Capita is an independent think tank and community.” Source: RevenueBase Database · checked Sep 22, 2026
10	Harvard's Belfer Center	Partial evidence	Cambridge, MA, United StatesHQ checked Sep 22, 2026	51-200	157 contacts →
	Partial evidence “Who We Are: The Belfer Center for Science and International Affairs is the hub of Harvard Kennedy School's research, teaching, and training in international security and…” Source: RevenueBase Database · checked Sep 22, 2026
11	Foreign Policy Research Institute	Strong evidence	Philadelphia, PA, United StatesHQ checked Sep 22, 2026	11-50	140 contacts →
	Strong evidence “The Foreign Policy Research Institute (FPRI) is an independent nonpartisan think tank based in Philadelphia, PA.” Source: RevenueBase Database · checked Sep 22, 2026
12	Federation Of American Scientists	Strong evidence	Washington, United StatesHQ checked Sep 22, 2026	11-50	128 contacts →
	Strong evidence “Evidence-Based Policy Research and Advocacy Since 1945.” Source: RevenueBase Database · checked Sep 22, 2026
13	Third WAY	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	127 contacts →
	Partial evidence “Third Way is a national think tank that champions modern center-left ideas.” Source: RevenueBase Database · checked Sep 22, 2026
14	Texas Public Policy Foundation	Partial evidence	Austin, TX, United StatesHQ checked Sep 22, 2026	51-200	122 contacts →
	Partial evidence “The public is demanding a different direction for their government, and the Texas Public Policy Foundation is providing the ideas that enable policymakers to chart that new course.” Source: RevenueBase Database · checked Sep 22, 2026
15	Potomac Institute For Policy Studies	Strong evidence	Arlington, VA, United StatesHQ checked Sep 22, 2026	51-200	113 contacts →
	Strong evidence “The Potomac Institute for Policy Studies is an independent, 501(c)(3), not-for-profit public policy research institute.” Source: RevenueBase Database · checked Sep 22, 2026
16	Public Policy Institute Of California	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 22, 2026	51-200	97 contacts →
	Strong evidence “Public Policy Institute of California (PPIC) is a nonprofit, nonpartisan think tank.” Source: RevenueBase Database · checked Sep 22, 2026
17	Niskanen Center	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	94 contacts →
	Strong evidence “Established in 2014, the Niskanen Center is a nonpartisan think tank that works to change public policy through direct engagement in the policymaking process: developing and…” Source: RevenueBase Database · checked Sep 22, 2026
18	NEW Lines Institute For Strategy And Policy	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	84 contacts →
	Strong evidence “New Lines Institute for Strategy and Policy is a nonprofit and non-partisan think tank in Washington D.C.” Source: RevenueBase Database · checked Sep 22, 2026
19	The Century Foundation	Strong evidence	New York, NY, United StatesHQ checked Sep 22, 2026	51-200	80 contacts →
	Strong evidence “The Century Foundation is a progressive, independent, public policy think tank.” Source: RevenueBase Database · checked Sep 22, 2026
20	Berggruen Institute	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 22, 2026	11-50	77 contacts →
	Partial evidence “The Berggruen Institute’s mission is to develop foundational ideas and, through them, shape political, economic and social institutions for the 21st century.” Source: RevenueBase Database · checked Sep 22, 2026
21	Mackinac Center For Public Policy	Strong evidence	Midland, United StatesHQ checked Sep 22, 2026	11-50	65 contacts →
	Strong evidence “The Mackinac Center for Public Policy is a nonpartisan research and educational institute dedicated to improving the quality of life for all Michigan residents by promoting sound…” Source: RevenueBase Database · checked Sep 22, 2026
22	PPI	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	58 contacts →
	Partial evidence “PPI's mission is to define and promote a new progressive politics for America in the 21st century.” Source: RevenueBase Database · checked Sep 22, 2026
23	The Heartland Institute	Strong evidence	Arlington Heights, IL, United StatesHQ checked Sep 22, 2026	11-50	56 contacts →
	Strong evidence “The Heartland Institute is one of the world’s leading free-market think tanks.” Source: RevenueBase Database · checked Sep 22, 2026
24	Sagamore	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 22, 2026	11-50	54 contacts →
	Partial evidence “Sagamore is a nonprofit, nonpartisan think tank.” Source: RevenueBase Database · checked Sep 22, 2026
25	Ramos Research Institute	Strong evidence	Ithaca, NJ, United StatesHQ checked Sep 22, 2026	11-50	44 contacts →
	Strong evidence “The Ramos Research Institute is a research institute working on original research, polling, and policy analysis to tackle today's wicked problems.” Source: RevenueBase Database · checked Sep 22, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: think tanks and policy research. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names think tanks and policy research.
Partial evidence: Its own public description names part of think tanks and policy research, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name think tanks and policy research. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 224 think tanks and policy research based in the United States

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Think tanks and policy research based in the United States at a glance

As of Sep 22, 2026

36.3%Verified-email coverage

53.5Average contacts per company

11-50Median size (employees)

24.6%Largest-city concentration · Washington

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 224 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among think tanks and policy research, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “think tanks and policy research”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names think tanks and policy research), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among think tanks and policy research, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 4,347 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 22, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Think tanks and policy research by metro

Think tanks and policy research in Washington55

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names think tanks and policy research, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many think tanks and policy research are there based in the United States?

RevenueBase identified 224 think tanks and policy research headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

RAND, headquartered in Santa Monica, tops this list with the largest team on record.

Which city has the most think tanks and policy research?

Washington leads with 55 headquartered companies, followed by New York (18) and Chicago (6).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 4,347 verified decision-maker contacts tracked across these 224 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 22, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.