Wikipedia.org, WordPress.org, NTP.org, nginx.org, and Mozilla.org are the five highest-ranked public .org websites in this list.

I built the ranking from Tranco list N2Q8W, dated August 28, 2026, and checked the selected sites on August 29.

A raw popularity list contains domains that serve ads, resolve network requests, distribute files, or support other websites without presenting a useful homepage to a person.

I removed those machine-facing entries before selecting the first 70 distinct websites.

A popular domain is not automatically a public website

Tranco combines ranking signals from browser use, DNS activity, and links.

That breadth makes it useful for comparing domains, but it also surfaces infrastructure alongside familiar websites.

For this article, a domain had to meet four conditions:

• end in .org;

• appear in the dated Tranco list;

• provide a current, human-facing website; and

• remain a distinct .org destination after redirects.

The filter removed ad systems, CDN and registry endpoints, pure DNS utilities, duplicate redirects, and adult sites.

For example, ampproject.org now redirects to amp.dev, so it does not belong in a current list of websites using .org.

Tranco rank is not a visitor count, trust score, or measure of social impact.

It gives us a reproducible order based on several popularity signals over 30 days.

Directory of 70 popular .ORG sites

Rank	Website	What you will find
1	Wikipedia.org	Community encyclopedia
2	WordPress.org	Open-source publishing platform
3	NTP.org	Network time resources
4	nginx.org	Web server project
5	Mozilla.org	Firefox and open-web programs
6	Apache.org	Open-source project foundation
7	Archive.org	Digital collections and web history
8	W3.org	Web standards
9	CreativeCommons.org	Open-content licenses
10	Telegram.org	Messaging apps
11	Wikimedia.org	Free-knowledge project portal
12	Debian.org	Linux distribution
13	GNU.org	Free software and licenses
14	UN.org	United Nations programs
15	CookieDatabase.org	Cookie and service reference
16	IETF.org	Internet engineering standards
17	arXiv.org	Research preprints
18	NPR.org	News, radio, and podcasts
19	IEEE.org	Engineering membership and standards
20	UNESCO.org	Education, science, and culture
21	Cambridge.org	Academic publishing and assessment
22	ISO.org	International standards
23	OpenStreetMap.org	Collaborative map data
24	Python.org	Python downloads and documentation
25	AllAboutCookies.org	Privacy and security education
26	HBR.org	Management ideas and research
27	MayoClinic.org	Health information and care
28	FrontiersIn.org	Research journals
29	WorldBank.org	Development data and projects
30	TheNAI.org	Advertising-industry standards
31	Change.org	Petitions and campaigns
32	WEForum.org	Global policy discussion
33	ArchiveOfOurOwn.org	Fanworks archive
34	Ecosia.org	Search engine
35	PBS.org	Public television and learning
36	Craigslist.org	Local classified listings
37	AdblockPlus.org	Ad-blocking software
38	OECD.org	Economic data and policy
39	Spamhaus.org	Internet threat intelligence
40	APA.org	Psychology research and profession
41	HLTV.org	Competitive gaming coverage
42	LetsEncrypt.org	Free TLS certificates
43	Coursera.org	Online courses and credentials
44	JW.org	Religious publications
45	Lichess.org	Free online chess
46	PLOS.org	Open-science journals
47	Kernel.org	Linux kernel releases
48	PostgreSQL.org	Database software
49	JSTOR.org	Scholarly library
50	Aternos.org	Hosted game servers
51	Wiktionary.org	Collaborative dictionary
52	TGJU.org	Currency and market data
53	BBB.org	Business and complaint profiles
54	IANA.org	Internet identifier coordination
55	FedoraProject.org	Fedora Linux community
56	EFF.org	Digital-rights advocacy
57	Syosetu.org	Community fiction publishing
58	ACM.org	Computing profession and research
59	FAO.org	Food and agriculture programs
60	ACS.org	Chemistry research and profession
61	Moodle.org	Open learning community
62	PewResearch.org	Public-opinion research
63	TheMovieDB.org	Community movie and TV database
64	ClevelandClinic.org	Health information and care
65	ORCID.org	Researcher identifiers
66	MITRE.org	Public-interest technology research
67	Science.org	Science journals and news
68	PNAS.org	Multidisciplinary research journal
69	FreeBSD.org	Open-source operating system
70	NodeJS.org	JavaScript runtime project

Ranks 1-10: platforms that shaped the web

1) Wikipedia.org

Wikipedia turns volunteer contributions into a multilingual reference work. The domain now functions as shorthand for freely accessible knowledge.

2) WordPress.org

WordPress is the community home of the downloadable CMS, plugin directory, theme directory, documentation, and contributor programs.

3) NTP.org

NTP publishes Network Time Protocol software and technical material for keeping computers and network devices on a common clock.

4) nginx.org

[nginx](https://nginx.org/) provides releases, documentation, and security notices for the open-source web server used throughout modern web infrastructure.

5) Mozilla.org

Mozilla brings Firefox downloads together with policy, advocacy, and programs intended to keep the internet open and accessible.

6) Apache.org

The Apache Foundation gives hundreds of open-source projects a shared governance, licensing, and community home.

7) Archive.org

The Internet Archive preserves digital media and past versions of websites through collections that include the Wayback Machine.

8) W3.org

W3C coordinates the specifications and guidance that help browsers, websites, and assistive technologies work together.

9) CreativeCommons.org

Creative Commons supplies standardized licenses that let creators define how other people may share and reuse their work.

10) Telegram.org

Telegram distributes its messaging applications from a .org address, showing that the extension remains open to commercial services.

Ranks 11-20: communities, protocols, and global work

11) Wikimedia.org

Wikimedia routes visitors to Wikipedia, Wikidata, Wiktionary, Commons, and the foundation’s other free-knowledge projects.

12) Debian.org

Debian supports its Linux distribution with downloads, package records, manuals, security information, and contributor resources.

13) GNU.org

GNU connects free software, the GNU operating system, public campaigns, and licenses such as the GPL.

14) UN.org

The United Nations uses a two-letter name to publish global work on peace, development, humanitarian response, and human rights.

15) CookieDatabase.org

Cookie Database catalogs cookies, scripts, and online services so website owners and visitors can understand tracking behavior.

16) IETF.org

The IETF organizes the working groups and open standards process behind many core internet protocols.

17) arXiv.org

arXiv lets researchers circulate papers in physics, mathematics, computing, and related fields before or alongside formal journal publication.

18) NPR.org

NPR combines national and local reporting with radio programs, music coverage, and podcasts.

19) IEEE.org

IEEE serves engineers through membership, conferences, publications, education, and technical standards.

20) UNESCO.org

UNESCO publishes programs and resources covering education, science, culture, communication, and heritage.

Ranks 21-30: knowledge, health, and policy resources

21) Cambridge.org

Cambridge presents books, journals, educational materials, exams, and assessment services from Cambridge University Press & Assessment.

22) ISO.org

ISO explains international standards and the expert committees that develop them across industries and technologies.

23) OpenStreetMap.org

OpenStreetMap lets contributors build and maintain geographic data that other people can view, download, and reuse.

24) Python.org

Python provides language releases, documentation, tutorials, events, and entry points into the Python developer community.

25) AllAboutCookies.org

All About Cookies publishes consumer-facing explanations and reviews related to privacy, identity protection, and online security.

26) HBR.org

HBR carries management research, case-based thinking, commentary, and practical advice from Harvard Business Review.

27) MayoClinic.org

Mayo Clinic pairs medical reference content with information about appointments, departments, and clinical care.

28) FrontiersIn.org

Frontiers runs open-access journals and gives researchers routes to submit, review, and discover scholarly work.

29) WorldBank.org

The World Bank makes development projects, country reports, indicators, and research accessible through one global domain.

30) TheNAI.org

The NAI publishes advertising-industry principles, policy positions, member information, and consumer choice tools.

Ranks 31-40: campaigns, media, and trust systems

31) Change.org

Change.org hosts petitions and organizing tools for individuals and campaigns, despite operating as a commercial company.

32) WEForum.org

The World Economic Forum publishes research, event discussions, and initiatives focused on economic and policy questions.

33) ArchiveOfOurOwn.org

AO3 gives fans a nonprofit, volunteer-supported archive for fiction and other transformative works.

34) Ecosia.org

Ecosia runs a search engine with an environmental business proposition, blending commercial operations with public-purpose branding.

35) PBS.org

PBS organizes video, programs, schedules, and educational resources from the public television network.

36) Craigslist.org

Craigslist has used .org for decades while operating local classified marketplaces for housing, jobs, goods, and services.

37) AdblockPlus.org

Adblock Plus provides browser extensions, help content, and project information for its ad-filtering software.

38) OECD.org

The OECD shares cross-country statistics, policy recommendations, reports, and economic analysis.

39) Spamhaus.org

Spamhaus publishes research and threat-intelligence services used to identify spam and malicious internet activity.

40) APA.org

The APA represents psychology through research, public education, professional resources, publishing, and standards.

Ranks 41-50: specialist audiences and open tools

41) HLTV.org

HLTV serves the competitive Counter-Strike audience with matches, player statistics, rankings, results, and reporting.

42) LetsEncrypt.org

Let’s Encrypt issues free automated TLS certificates, lowering the cost and friction of adopting HTTPS.

43) Coursera.org

Coursera sells courses, certificates, and degree programs from universities and companies through a commercial learning platform.

44) JW.org

JW.org publishes the official teachings, news, media, and organizational information of Jehovah’s Witnesses in many languages.

45) Lichess.org

Lichess offers free chess games, tournaments, puzzles, studies, and analysis through an open-source platform.

46) PLOS.org

PLOS operates open-access journals and promotes research practices that make scientific work easier to share and examine.

47) Kernel.org

Kernel.org gives developers an authoritative location for Linux kernel releases, repositories, and project information.

48) PostgreSQL.org

PostgreSQL supports the database project with downloads, manuals, release notes, events, and community information.

49) JSTOR.org

JSTOR provides searchable access to journals, books, images, and primary sources for research and education.

50) Aternos.org

Aternos lets players create and manage hosted game servers, with Minecraft as its best-known use case.

Ranks 51-60: governance, rights, and professional bodies

51) Wiktionary.org

Wiktionary applies Wikimedia’s collaborative model to definitions, translations, pronunciations, and word origins.

52) TGJU.org

TGJU tracks Iranian and international currencies, gold, metals, market indexes, and other financial data.

53) BBB.org

The BBB publishes business profiles, ratings, consumer reviews, and complaint information across its regional network.

54) IANA.org

IANA coordinates DNS root-zone information, IP address pools, and protocol parameter registries.

55) FedoraProject.org

Fedora presents downloads, editions, documentation, and participation routes for the Fedora Linux community.

56) EFF.org

The EFF combines litigation, policy work, technical tools, and public campaigns around digital civil liberties.

57) Syosetu.org

Syosetu runs a Japanese web-fiction community where members publish, discover, and discuss serialized stories.

58) ACM.org

The ACM supports computing research and practice through conferences, publications, professional groups, and education.

59) FAO.org

The FAO publishes global programs, data, and guidance related to food systems, agriculture, and hunger.

60) ACS.org

The ACS serves chemistry through journals, education, careers, meetings, standards, and professional membership.

Ranks 61-70: learning, science, and research infrastructure

61) Moodle.org

Moodle is the community hub for the open-source learning platform, including support forums, downloads, plugins, and contributor activity.

62) PewResearch.org

Pew Research publishes nonpartisan polling, demographic analysis, international surveys, datasets, and research methods.

63) TheMovieDB.org

TMDB maintains a community-built database of movies, television programs, people, images, and release information.

64) ClevelandClinic.org

Cleveland Clinic offers health reference content alongside information about care, specialists, locations, and appointments.

65) ORCID.org

ORCID gives researchers persistent identifiers that connect their names with publications, affiliations, funding, and other work.

66) MITRE.org

MITRE conducts public-interest research and operates federally funded research and development centers in the United States.

67) Science.org

Science is the digital home for AAAS journals, scientific news, commentary, and research careers.

68) PNAS.org

PNAS publishes peer-reviewed research across biological, physical, and social sciences through the National Academy of Sciences.

69) FreeBSD.org

FreeBSD supplies releases, documentation, security advisories, and community resources for the open-source operating system.

70) NodeJS.org

Node.js distributes the open-source JavaScript runtime and provides documentation, release information, learning material, and contribution routes.

What .ORG signals, and what it cannot prove

The examples explain why people associate .org with service, learning, standards, and communities. They also show why the extension cannot function as a trust certificate.

Public Interest Registry confirms that .org is open to anyone. Registration does not require nonprofit status, an educational charter, or evidence of public benefit.

A .org address may signal:

• a mission larger than a product sale;

• an organization or member community;

• an open-source or shared-knowledge project; or

• a public resource, standard, or institution.

It cannot prove:

• nonprofit or tax-exempt status;

• factual accuracy or editorial independence;

• secure technology or responsible data handling; or

• honest leadership and financial practices.

Four patterns across the 70 sites

Open technology belongs near the top

WordPress, NTP, nginx, Mozilla, Apache, Debian, GNU, Python, PostgreSQL, FreeBSD, and Node.js show how strongly open technical communities use .org. Their sites need contributors, documentation, and public governance as much as downloads.

Commercial activity does not disqualify a domain

Telegram, HBR, Change.org, Ecosia, Craigslist, Coursera, Aternos, and other commercial services appear in the ranking. They can use .org because the registry does not restrict eligibility.

Short names compound recognition

Domains such as un.org, w3.org, iso.org, eff.org, and acs.org pair familiar initials with a familiar extension. The result is easy to say, print, and remember.

Reputation comes from the operator

Mayo Clinic, the World Bank, Pew Research Center, and the scientific publishers earn attention through their institutions, methods, and content. The extension supports their positioning; it does not create their authority.

Does .ORG fit your name?

Start with the expectation your visitor should have before opening the site.

Choose .org when your clearest identity is a cause, association, research effort, open project, professional body, religious organization, public resource, or member community. A commercial company can still use it, but the homepage should resolve any mismatch immediately.

Before registration, check three things:

• Meaning: Does .org make your purpose clearer rather than more confusing?

• Memory: Can someone repeat and spell the complete domain after hearing it once?

• Proof: Does the website show the people, policies, contact information, and evidence needed to earn trust?

Our ORG guide covers the extension’s rules and registration details. Use our extension guide when you are still comparing .org with other endings.

When you have a shortlist, use our domain search to check each name.

You can register the available .org with us, connect it to hosting, and use our site builder to publish the first version.

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