Company lists · Data refreshed September 2026
Top 25 Fraternal organizations based in the United States
RevenueBase identified 522 fraternal organizations headquartered in the United States as of September 2026 and tracks 27,486 professional contacts across them, including 1,915 with verified work emails. Indianapolis is the largest hub.
This list covers fraternal organizations 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 19, 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.
The 25 largest fraternal organizations based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 3,305 contacts → | ||||
Strong evidence “A Catholic fraternal organization founded in 1882 at St.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,396 contacts → | ||||
Indirect evidence “Since its founding at the University of Virginia on December 10, 1869, Kappa Sigma has initiated more than men on college campuses throughout the United States and Canada.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,176 contacts → | ||||
Strong evidence “OUR MISSION Phi Delta Theta was built on three pillars that haven’t budged an inch since the Fraternity was founded by “The Immortal Six” way back in 1848 at Miami University.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,161 contacts → | ||||
Indirect evidence “Pi Kappa Phi is a collegiate men's organization focused on providing a solid experience in key areas of male development including social interaction, scholarship, leadership and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,024 contacts → | ||||
Strong evidence “The Fraternity of Phi Gamma Delta, also known as Phi Gam or Fiji, was founded May 1, 1848 at Jefferson College (now Washington & Jefferson College).” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 951 contacts → | ||||
Strong evidence “Sigma Nu (ΣΝ) is a college fraternity that was founded by James Frank Hopkins, Greenfield Quarles and James McIlvaine Riley at the Virginia Military Institute in Lexington…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 921 contacts → | ||||
Indirect evidence “Founded in 1858 at Bethany College in what is now northern West Virginia Delta Tau Delta is a values-based organization with Truth, Courage, Faith and Power as her core values.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 889 contacts → | ||||
Indirect evidence “Alpha Phi Omega is the single most represented co-educational intercollegiate service organization in the United States.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 874 contacts → | ||||
Strong evidence “Lambda Chi Alpha Fraternity is one of the largest men’s general fraternities in North America with more than initiated members and has held chapters at more than 300 universities.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 822 contacts → | ||||
Strong evidence “Phi Kappa Psi Fraternity is a values based men's social organization.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 792 contacts → | ||||
Indirect evidence “Alpha Tau Omega began as an idea in the mind of a young Civil War veteran who wanted peace and reconciliation.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 781 contacts → | ||||
Strong evidence “Alpha Sigma Phi Fraternity is equally owned and operated by its initiated brothers.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 748 contacts → | ||||
Indirect evidence “Welcome to the Chi Omega Executive Headquarters Company page!” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 608 contacts → | ||||
Strong evidence “Delta Chi (ΔΧ) is an international Greek letter college social fraternity formed on October 13, 1890, at Cornell University, initially as a professional fraternity for law…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 524 contacts → | ||||
Strong evidence “Sigma Pi Fraternity was founded in 1897 at Vincennes University, in Vincennes, Indiana.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 505 contacts → | ||||
Strong evidence “Delta Sigma Phi is a men's fraternity with active chapters in 33 states of the USA.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 418 contacts → | ||||
Strong evidence “Delta Upsilon, an international men's fraternity founded in 1834, is committed to Building Better Men through our Four Founding Principles, Friendship, Character, Culture, and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 391 contacts → | ||||
Strong evidence “Founded in 1906 at Miami University in Oxford, Ohio, Phi Kappa Tau is a national fraternity that focuses on developing men of distinction.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 298 contacts → | ||||
Indirect evidence “Chi Phi was founded on the basis of Truth, Honor, and Personal Integrity.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 259 contacts → | ||||
Indirect evidence “Phi Sigma Kappa is a lifelong brotherhood dedicated to the betterment of the individual, the university community, and our world, by giving its members opportunities to develop…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 223 contacts → | ||||
Strong evidence “Chi Psi Fraternity is a strong presence at 34 of America's finest and most respected institutions of higher learning.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 178 contacts → | ||||
Strong evidence “The Zeta Psi Fraternity, Zeta Psi Educational Foundation, and affiliated organizations and nearly 100 undergraduate and Elder chapters seeks to provide student and Elder members…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 176 contacts → | ||||
Strong evidence “Phi Sigma Pi National Honor Fraternity is a gender-inclusive organization dedicated to: promoting lifelong learning, inspiring Members to lead, and cultivating lasting fraternal…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 172 contacts → | ||||
Strong evidence “From life insurance to annuities, Catholic Financial Life, a Trusted Fraternal Life brand, has been helping people financially protect their loved ones for more than 155 years.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 161 contacts → | ||||
Indirect evidence “Phi Kappa Sigma is more than an organization to be a part of during college; it is a valuable learning experience, a life-ling commitment, and philosophy of life.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
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: fraternal organizations. 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 fraternal organizations.
- Partial evidence
- Its own public description names part of fraternal organizations, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name fraternal organizations. 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 522 fraternal organizations based in the United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,915 reachable decision-makers.
Free signup · no credit card
Fraternal organizations based in the United States at a glance
As of Sep 19, 2026Companies by employee count
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 522 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 fraternal organizations, 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 “fraternal organizations”. 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 fraternal organizations), 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 fraternal organizations, 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, 1,915 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 19, 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.
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 fraternal organizations, 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 fraternal organizations are there based in the United States?
RevenueBase identified 522 fraternal organizations 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?
Knights Of Columbus, headquartered in New Haven, tops this list with the largest team on record.
Which city has the most fraternal organizations?
Indianapolis leads with 18 headquartered companies, followed by Columbus (9) and Pittsburgh (9).
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 1,915 verified decision-maker contacts tracked across these 522 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 19, 2026.
Ready to reach these companies? Verified emails and direct dials for all 522 fraternal organizations based in the United States. Start with a free account, no credit card.
Download this list →Related lists
Browse the directory
Browse: Companies home · All United States lists · All Fraternal organizations lists · New lists
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- AI companies based in the United States
- Cybersecurity companies based in the United States
- Manufacturing companies based in the United States
- Media companies based in the United States
- Oil and gas companies based in the United States
- Real estate companies based in the United States