As of 2026-10-13, Pennsylvania Republican Party tops the list with 3,030,017 members.
- #1 Pennsylvania Republican Party — 3,030,017 members
Affiliate of the Republican Party in the state of Pennsylvania
The Pennsylvania Republican Party (PAGOP) is the affiliate of the Republican Party in the state of Pennsylvania, headquartered in Harrisburg. Its chairman is state senator Greg Rothman. Read more on Wikipedia.
Wikidata - #2 Reichsbanner Schwarz-Rot-Gold — 1,500,000 members
German political orginasation
The Reichsbanner Schwarz-Rot-Gold was an organization in Germany during the Weimar Republic with the goal to defend German parliamentary democracy against internal subversion and extremism from the left and right and to compel the population to respect and honour the new Republic's flag and constitution. It was formed by members of the centre-left to left-wing Social Democratic Party of Germany (SPD), the centre to centre-right German Centre Party, and the centre to centre-left German... Read more on Wikipedia.
Wikidata - #3 Korean Democratic Women's League — 250,000 members
North Korean mass organization for women
The Socialist Women's Union of Korea is a mass organization for women in North Korea. Founded in 1945, it is the oldest and one of the most important mass organizations in the country. Read more on Wikipedia.
Wikidata - #4 White Rus — 166,264 members
Belarusian pro-Lukashenko political party
The Belarusian Party "Belaya Rus", or simply Belaya Rus, is a centrist political party in Belarus. It supports the policies of Alexander Lukashenko, the first and only president of post-Soviet Belarus. Read more on Wikipedia.
Wikidata - #5 Democratic Socialists of America — 108,089 members
US political organization
The Democratic Socialists of America (DSA) is a socialist political organization in the United States, and the largest such organization in US history, with more than 120,000 members as of July 2026. A big tent on the left wing of the political spectrum, it is primarily organized around the principles of democratic socialism, with its members active in electoral politics, labor organizing, and direct action campaigns. Read more on Wikipedia.
Wikidata - #6 Taliban — 70,000 members
Afghan islamist organization
The Taliban is a Islamist militant organization which has governed Afghanistan since 2021. Having previously ruled the country from 1996 to 2001, the group was overthrown following the United States invasion of Afghanistan and fought a twenty-year war which ended in their return to power. Read more on Wikipedia.
Wikidata - #7 Assemblea Nacional Catalana — 45,960 members
pro-independence organization
The Assemblea Nacional Catalana is an organization that seeks the political independence of Catalonia from Spain. It also promotes the independence of other Catalan-speaking regions, which are collectively known as the Catalan Countries. Read more on Wikipedia.
Wikidata - #8 More United — 23,903 members
political movement
More United was a cross-party political movement in the United Kingdom. It described itself as a "tech-driven political startup" that supported candidates regardless of party affiliation. The movement advocated for public service investment, democratic reform, a green economy, tolerant society, and co-operation with the EU. Read more on Wikipedia.
Wikidata - #9 Hamas — 20,000 members
Palestinian Islamist political and military organization
The Islamic Resistance Movement, abbreviated Hamas, is a Sunni Islamist Palestinian nationalist political organisation with a military wing known as the al-Qassam Brigades. It has governed the Israeli-occupied Gaza Strip since 2007. In July 2026, it announced the resignation of its civilian administration under the Gaza peace plan and US president Donald Trump announced that his Board of Peace had reached an agreement to disarm Hamas. Read more on Wikipedia.
Wikidata - #10 Right Sector — 12,000 members
Ukrainian nationalist movement
Right Sector is a loosely defined coalition of right-wing to far-right Ukrainian nationalist organizations. It originated in November 2013 as a right-wing, paramilitary confederation of several ultranationalist organizations at the Euromaidan revolt in Kyiv, where its street fighters participated in clashes with riot police. The coalition became a political party on 22 March 2014, at which time it claimed to have roughly 10,000 members. Founding groups included the Trident (Tryzub), led by... Read more on Wikipedia.
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