The right to assemble is recognized as a human right and protected in the First Amendment of the US Constitution under the clause, "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances."^[1]

Widespread mass protest became a distinct characteristic of the late 20th and early 21st century American civic engagement, with the rate of mass protests rising exponentially since the mid 2010s thanks in part to the sudden and widespread availability of smartphones as well as the social media revolution allowing instant and widespread communication and planning, with each of the top ten attended protests occurring since 1970 and four of the top five occurring since the start of the Trump administration in 2017.

In 1995, the National Park Service estimated 400,000 people attended the Million Man March in Washington, D.C., the official count for the event.^[2] The organizers said more than a million people turned out, and they threatened to sue the Park Service unless it revised its estimate. Congress, in response, barred the agency from producing any more crowd estimates.^[3]

Since then, official crowd estimates for organized political protests, demonstrations, and marches have relied on an amalgam of police data, organizer estimates, the research of crowd scientists, and journalists.^[4]

Rows shaded in yellow indicates the protest happened in multiple cities simultaneously across the United States.

More information Rank, Name ...

Rank	Name	Attendance	City	Territory	Year	Issue
1	George Floyd Protests/2020–2023 United States racial unrest	15,000,000 - 26,000,000[5]	Nationwide	USA	2020	Police Brutality
2	Earth Day	20,000,000[6]	Nationwide	USA	1970	Environmental protection
3	2017 Women's March	3,300,000–5,600,000[7][8]	Nationwide	USA	2017	Feminism
4	March for Our Lives	1,200,000-2,000,000[9][10][11][12]	Nationwide	USA	2018	Gun control
5	2018 Women's March	1,500,000[13]	Nationwide	USA	2018	Feminism
6	#RickyRenuncia	~1,100,000[14]	San Juan	Puerto Rico	2019	Anti-corruption; see Telegramgate
7	Great American Boycott	~1,000,000[15]	Nationwide	USA	2006	Immigrant rights
8	March on Washington for Lesbian, Gay and Bi Equal Rights and Liberation	800,000–1,000,000[16][17]	Washington D.C.	District of Columbia	1993	LGBT rights
9	Anti-nuclear weapon march, part of the Nuclear Freeze campaign	700,000–1,000,000[18][19]	New York City	New York	1982	Anti-nuclear
10	Million Man March	670,000–800,000[20]	Washington D.C.	District of Columbia	1995	Anti-racism
11	March for Women's Lives	500,000–1,000,000[21][22]	Washington D.C.	District of Columbia	2004	Feminism
12	Million Mom March	750,000[23]	Washington D.C.	District of Columbia	2000	Gun control
13	March for Science	400,000–1,000,000[24][25][better source needed]	Nationwide	USA	2017	Science
14	March for Life	400,000-650,000 (2013 estimate from rally organizers)[26][27]	Washington D.C.	District of Columbia	2013	Pro-life
15	Million Woman March	500,000[28]	Philadelphia	Pennsylvania	1997	Black feminism
16	Moratorium to End the War in Vietnam	500,000[29]	Washington D.C.	District of Columbia	1969	Anti-Vietnam War
17	People's Climate March	311,000–400,000[30][31]	New York City	New York	2014	Climate Change
18	September 2019 climate strikes	315,000[32]	New York City	New York	2019	Climate Change
19	Tea Party Tax Day protests	c. 311,000[33]	Nationwide	USA	2009	Fiscal conservatism
20	March on Washington for Jobs and Freedom	250,000–300,000[34][35]	Washington D.C.	District of Columbia	1963	Civil rights
21	Solidarity Day march	250,000–260,000[36][37]	Washington D.C.	District of Columbia	1981	Labor rights
22	February 15 Iraq war protests	200,000–375,000[38][39]	New York City	New York	2003	Anti-Iraq War
23	Rally to Restore Sanity and/or Fear	215,000[40]	Washington D.C.	District of Columbia	2010	Civil discourse
24	March on Washington for Lesbian and Gay Rights	200,000[41]	Washington D.C.	District of Columbia	1987	LGBT rights
25	National March on Washington: Free Palestine	100,000-300,000[42][43]	Washington D. C.	District of Columbia	2023	Free Palestine movement
26	March for Israel	100,000-290,000[44][45]	Washington D. C.	District of Columbia	2023	Antisemitism
27	2015 Armenian March for Justice	130,000+[46]	Los Angeles	California	2015	Armenian genocide recognition
28	Proposition 187 Protests	70,000[47]	Los Angeles	California	1994	Immigrant rights
29	1999 Seattle WTO protests	40,000	Seattle	Washington	1999	Anti-globalization

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• List of protests in the United States
• List of protests in the 21st century