List of Triangle chapters
A list of the current and former chapters, colonies, and interest groups of Triangle Fraternity.[1]
Chapters
    
    Collegiate Chapters
    
| Color key | 
|---|
|   — Active chapter   — Inactive chapter   — Recolonizing chapter | 
| School | Location | Chapter | Date Installed | Years Active | Notes | |
|---|---|---|---|---|---|---|
| 1 | University of Illinois at Urbana–Champaign | Champaign, IL | ill | April 15, 1907 | 1907–present | founding chapter | 
| 2 | Purdue University | West Lafayette, IN | pur | April 8, 1909 | 1909–present | |
| 3 | Ohio State University | Columbus, OH | os | February 2, 1911 | 1911–present | |
| 4 | University of Wisconsin–Madison | Madison, WI | wis | February 7, 1913 | 1913–present | |
| 5 | University of Kentucky | Lexington, KY | ky | October 31, 1920 | 1920–1983, 2005–present | |
| 6 | University of Cincinnati | Cincinnati, OH | cin | August 6, 1921 | 1921–2005, 2014–present | |
| 7 | University of Iowa | Iowa City, IA | ia | May 7, 1922 | 1922–1948 | |
| 8 | University of Minnesota | Minneapolis, MN | minn | October 29, 1922 | 1922–present | |
| 9 | Illinois Institute of Technology | Chicago, IL | ar | May 26, 1923 | 1923–present | originally installed as Armour Institute of Technology | 
| 10 | University of Missouri | Columbia, MO | mo | October 25, 1924 | 1924–1933 | |
| 11 | University of Michigan | Ann Arbor, MI | mich | February 21, 1925 | 1925–1971, 1975–1995, 2007–present | “Goated with the sauce” | 
| 12 | University of Kansas | Lawrence, KS | kan | January 8, 1927 | 1927–present | |
| 13 | Missouri University of Science and Technology | Rolla, MO | mom | December 10, 1927 | 1927–present | originally installed as Missouri School of Mines | 
| 14 | Pennsylvania State University | State College, PA | ps | March 3, 1928 | 1928–present | |
| 15 | South Dakota School of Mines and Technology | Rapid City, SD | sdm | September 27, 1930 | 1930–present | |
| 16 | Northwestern University | Evanston, IL | nu | May 25, 1935 | 1935–1987 | |
| 17 | Marquette University | Milwaukee, WI | marq | April 24, 1937 | 1937–2019, 2021-present | |
| 18 | University of Louisville | Louisville, KY | lou | March 22, 1941 | 1941–present | |
| 19 | Cornell University | Ithaca, NY | cor | April 18, 1942 | 1942–1985 | |
| 20 | Michigan State University | East Lansing, MI | msu | January 8, 1955 | 1955–present | |
| 21 | Clarkson University | Potsdam, NY | cl | November 16, 1957 | 1957–1970 | |
| 22 | University of California, Los Angeles | Los Angeles, CA | ucla | December 7, 1957 | 1957–present | |
| 23 | University of Nebraska–Lincoln | Lincoln, NE | neb | March 16, 1963 | 1963–2011, 2016–present | |
| 24 | Iowa State University | Ames, IA | is | April 25, 1964 | 1964–2011, 2018–present | chapter status reinstated 2018 | 
| 25 | Kansas State University | Manhattan, KS | ks | September 7, 1964 | 1964–2019 | |
| 26 | Oklahoma State University | Stillwater, OK | oks | November 21, 1964 | 1964–1995 | |
| 27 | Milwaukee School of Engineering | Milwaukee, WI | msoe | January 23, 1965 | 1965–present | |
| 28 | Rochester Institute of Technology | Rochester, NY | rit | February 4, 1967 | 1967–2010 | |
| 29 | Colorado State University | Fort Collins, CO | csu | May 27, 1967 | 1967–2006, 2012–present | |
| 30 | Rose–Hulman Institute of Technology | Terre Haute, IN | rose | May 4, 1968 | 1968–present | |
| 31 | University of Colorado | Boulder, CO | colo | April 26, 1969 | 1969–1972 | |
| 32 | University of Pittsburgh | Pittsburgh, PA | pitt | April 4, 1970 | 1970–2001, 2007–present | |
| 33 | University of Wisconsin–Milwaukee | Milwaukee, WI | uwm | April 11, 1970 | 1970–present | |
| 34 | University of Toledo | Toledo, OH | tol | May 22, 1971 | 1971–present | |
| 35 | Mississippi State University | Starkville, MS | miss | November 11, 1972 | 1972–1987 | |
| 36 | University of Oklahoma | Norman, OK | ok | November 18, 1979 | 1979–present | |
| 37 | Virginia Polytechnic Institute | Blacksburg, VA | vpi | April 19, 1980 | 1980–1996 | colonization in progress | 
| 38 | University of Connecticut | Storrs, CT | conn | March 27, 1982 | 1982–1998 | |
| 39 | University of Texas at Arlington | Arlington, TX | uta | September 27, 1986 | 1986–2000 | |
| 40 | Texas A&M University | College Station, TX | tamu | April 9, 1988 | 1988–1999, 2007–2009 | |
| 41 | Michigan Technological University | Houghton, MI | mtu | April 16, 1988 | 1988–2006, 2012–present | |
| 42 | Trine University | Angola, IN | tsu | April 15, 1989 | 1989–2008 | originally installed as Tri-State University | 
| 43 | University of Akron | Akron, OH | akr | November 2, 1991 | 1991–1997 | |
| 44 | Northern Illinois University | DeKalb, IL | niu | October 9, 1993 | 1993–2006 | |
| 45 | University of Maryland, Baltimore County | Maryland, MD | umbc | June 4, 2005 | 2005–2019 | |
| 46 | University of Houston | Houston, TX | hou | April 19, 2008 | 2008–2019 | |
| 47 | University of California, Berkeley | Berkeley, CA | cal | April 24, 2010 | 2010–2016 | |
| 48 | University of California, San Diego | San Diego, CA | ucsd | February 11, 2011 | 2011–present | |
| 49 | University of North Carolina at Charlotte | Charlotte, NC | char | April 30, 2011 | 2011–present | |
| 50 | California State Polytechnic University, Pomona | Pomona, CA | cpp | May 7, 2011 | 2011–present | |
| 51 | University of California, Irvine | Irvine, CA | uci | September 29, 2012 | 2012–present | |
| 52 | Florida Atlantic University | Boca Raton, FL | fau | September 7, 2013 | 2013–2019 | |
| 53 | Penn State Erie, The Behrend College | Erie, PA | psb | February 28, 2015 | 2015–present | |
| 54 | Virginia Commonwealth University | Richmond, VA | vcu | April 11, 2015 | 2015–present | |
| 55 | University of Utah | Salt Lake City, UT | utah | April 25, 2015 | 2015–present | |
| 56 | Clemson University | Clemson, SC | clem | April 8, 2017 | 2017–present | possessors of Rattle III | 
The Rattle is kept by the youngest (baby) chapter, and passed to a newer chapter when chartered.
Colonies and Interest Groups
    
The "Interest Group" category has been retired by the Fraternity, and has been folded into the "Colony" designation.
| School | Chapter | Years Active | Notes | 
|---|---|---|---|
| Southern Illinois University | siu | 1976–1981 | |
| University of Arizona | ariz | 1977–1979 | |
| University of Maryland | md | 1978–1980, 1998–2000 | |
| Mankato State University | mks | 1988–1994 | |
| Tennessee Technological University | ttu | 1988–1993 | |
| Wright State University | ws | 1992–1996 | |
| University of Florida | fl | 2005–2006 | |
| Oregon State University | orst | 2010–2017 | |
| New Jersey Institute of Technology | njit | 2012–2013 | did not reach colony status | 
| Carnegie Mellon University | cmu | 2014–2015 | |
| Florida Institute of Technology | fit | 2014–2016 | did not reach colony status | 
| Georgia Institute of Technology | gt | 2014–2019 | |
| Arizona State University | asu | 2018–2019 | |
| University of Washington | uw | 2018–present | Installation in Spring 2020 postponed due to Covid-19 | 
Statistics
    
    New Chapters By Decade
    
| Decade | Total | New Chapters | 
|---|---|---|
| 1907-1909 | 2 |    | 
| 1910-1919 | 2 |    | 
| 1920-1929 | 10 |                    | 
| 1930-1939 | 3 |      | 
| 1940-1949 | 2 |    | 
| 1950-1959 | 3 |      | 
| 1960-1969 | 9 |                  | 
| 1970-1979 | 5 |          | 
| 1980-1989 | 6 |            | 
| 1990-1999 | 2 |    | 
| 2000-2009 | 2 |    | 
| 2010-2019 | 10 |                    | 
Chapters By Region
    
| 
 |  The four regions of the United States 
 | 
References
    
- "Active Chapters & Colonies". Triangle Fraternity. 2015. Retrieved 2015-05-10.
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