Top 21 Fraternities in United States
This curated ranking covers the 21 largest fraternities in United States, ordered by estimated audience size from Rascasse's anonymized search-behavior signals. Chi Omega, Alpha Phi Alpha and Sigma Chi lead the list with a combined estimated audience of 1,934,118 people. Across all 21 entries the average audience size is 290,070, and the largest, Chi Omega, reaches around 748,338 people in United States. Audience size is the estimated number of unique people in United States who actively engage with each fraternity, derived from search demand signals. Rankings reflect search-behavior signals collected across United States and are refreshed weekly.
Ranking
| Rank | Name | Audience size | Country share | Subtype | Category |
|---|---|---|---|---|---|
| 1 |  Chi Omega |
748,338 | 95.1% | Fraternity | Business & Career |
| 2 |  Alpha Phi Alpha |
715,456 | 98.0% | Fraternity | Business & Career |
| 3 |  Sigma Chi |
470,324 | 83.5% | Fraternity | Business & Career |
| 4 |  Alpha Chi Omega |
426,937 | 96.8% | Fraternity | Business & Career |
| 5 |  Zeta Tau Alpha |
421,385 | 65.6% | Fraternity | Business & Career |
| 6 |  Alpha Omicron Pi |
404,071 | 91.1% | Fraternity | Business & Career |
| 7 |  Kappa Alpha Psi |
400,641 | 97.7% | Fraternity | Business & Career |
| 8 |  Pi Beta Phi |
372,136 | 91.2% | Fraternity | Business & Career |
| 9 |  Kappa Sigma |
369,758 | 84.3% | Fraternity | Business & Career |
| 10 |  Alpha Xi Delta |
327,447 | 95.8% | Fraternity | Business & Career |
| 11 |  Tau Beta Sigma |
319,479 | 4.2% | Fraternity | Business & Career |
| 12 |  Alpha Gamma Delta |
286,427 | 39.1% | Fraternity | Business & Career |
| 13 |  Tau Kappa Epsilon |
277,596 | 44.8% | Fraternity | Business & Career |
| 14 |  Sigma Nu |
239,460 | 79.5% | Fraternity | Business & Career |
| 15 |  Lambda Chi Alpha |
188,627 | 90.5% | Fraternity | Business & Career |
| 16 |  Tau Beta Pi |
75,341 | 46.2% | Fraternity | Business & Career |
| 17 |  Kappa Alpha Theta |
22,462 | 84.8% | Fraternity | Business & Career |
| 18 |  Delta Lambda Phi |
8,658 | 91.9% | Fraternity | Business & Career |
| 19 |  Iota Phi Theta |
7,596 | 98.8% | Fraternity | Business & Career |
| 20 |  Tau Delta Phi |
5,690 | 63.8% | Fraternity | Business & Career |
| 21 | Sigma Alpha Iota |
3,650 | 73.5% | Fraternity | Business & Career |
Frequently asked questions
How is this Top 21 list compiled?
Rascasse aggregates anonymized search-behavior signals across United States and ranks each fraternity by its estimated audience size. Only entries with at least 5 measured entities are listed.
How often is the list updated?
The ranking is refreshed weekly from the latest search-behavior data and re-published as a static page.
What is the largest fraternity in United States?
Chi Omega currently leads with an estimated audience of 748,338 people in United States.
Methodology
Audience sizes are estimated from anonymized search-behavior signals across United States. Lists below 5 entries are not published. See methodology for full details.