# List of Triangle chapters

Triangle is an engineering fraternity that was established at the University of Illinois in 1907.

## Chapters

In the following list, active chapters are indicated in bold and inactive chapters are indicated in italics.
| Chapter | Symbol | Charter date and range | Institution | Location | Status |
| Illinois | ill | April 15, 1907 | University of Illinois at Urbana–Champaign | Champaign, Illinois | Active |
| Purdue | pur | April 8, 1909 | Purdue University | West Lafayette, Indiana | Active |
| Ohio State | os | February 2, 1911 | Ohio State University | Columbus, Ohio | Active |
| Wisconsin | wis | February 7, 1913 | University of Wisconsin–Madison | Madison, Wisconsin | Active |
| Kentucky | ky | October 31, 1920 – 1983; 2005 | University of Kentucky | Lexington, Kentucky | Active |
| Cincinnati | cin | August 6, 1921 – 2005; 2014 | University of Cincinnati | Cincinnati, Ohio | Active |
| Iowa | ia | May 7, 1922 – 1948 | University of Iowa | Iowa City, Iowa | Inactive |
| Minnesota | minn | October 29, 1922 | University of Minnesota | Minneapolis, Minnesota | Active |
| Armour | ar | May 26, 1923 | Illinois Institute of Technology | Chicago, Illinois | Active |
| Missouri | mo | October 25, 1924 – 1933 | University of Missouri | Columbia, Missouri | Inactive |
| Michigan | mich | February 21, 1925 – 1971; 1975–1995; 2007 | University of Michigan | Ann Arbor, Michigan | Active |
| Kansas | kan | January 8, 1927 | University of Kansas | Lawrence, Kansas | Active |
| Missouri Mines | mom | December 10, 1927 | Missouri University of Science and Technology | Rolla, Missouri | Active |
| Penn State | ps | March 3, 1928 | Pennsylvania State University | State College, Pennsylvania | Active |
| South Dakota Mines | sdm | September 27, 1930 | South Dakota School of Mines and Technology | Rapid City, South Dakota | Active |
| Northwestern | nu | May 25, 1935 – 1987 | Northwestern University | Evanston, Illinois | Inactive |
| Marquette | marq | April 24, 1937 – 2019; 2021 | Marquette University | Milwaukee, Wisconsin | Active |
| Louisville | lou | March 22, 1941 | University of Louisville | Louisville, Kentucky | Active |
| Cornell | cor | April 18, 1942 – 1985 | Cornell University | Ithaca, New York | Inactive |
| Michigan State | msu | January 8, 1955 | Michigan State University | East Lansing, Michigan | Active |
| Clarkson | cl | November 16, 1957 – 1970 | Clarkson University | Potsdam, New York | Inactive |
| UCLA | ucla | December 7, 1957 | University of California, Los Angeles | Los Angeles, California | Active |
| Nebraska | neb | March 16, 1963 – 2011; 2016 | University of Nebraska–Lincoln | Lincoln, Nebraska | Colony |
| Iowa State | is | April 25, 1964 – 2011; 2018 | Iowa State University | Ames, Iowa | Active |
| Kansas State | ks | September 7, 1964 – 2019 | Kansas State University | Manhattan, Kansas | Inactive |
| Oklahoma State | oks | November 21, 1964 – 1995 | Oklahoma State University | Stillwater, Oklahoma | Inactive |
| M.S.O.E. | msoe | January 23, 1965 | Milwaukee School of Engineering | Milwaukee, Wisconsin | Active |
| R.I.T. | rit | February 4, 1967 – 2010 | Rochester Institute of Technology | Rochester, New York | Inactive |
| Colorado State | csu | May 27, 1967 – 2006; 2012 | Colorado State University | Fort Collins, Colorado | Active |
| Rose Tech | rose | May 4, 1968 | Rose–Hulman Institute of Technology | Terre Haute, Indiana | Active |
| Colorado | colo | April 26, 1969 – 1972 | University of Colorado at Boulder | Boulder, Colorado | Inactive |
| Pitt | pitt | April 4, 1970 – 2001; 2007 | University of Pittsburgh | Pittsburgh, Pennsylvania | Active |
| UWM | uwm | April 11, 1970 | University of Wisconsin–Milwaukee | Milwaukee, Wisconsin | Active |
| Toledo | tol | May 22, 1971 | University of Toledo | Toledo, Ohio | Active |
| Mississippi State | miss | November 11, 1972 – 1987 | Mississippi State University | Starkville, Mississippi | Inactive |
| Oklahoma | ok | November 18, 1979 – 2024 | University of Oklahoma | Norman, Oklahoma | Inactive |
| Virginia Tech | vpi | April 19, 1980 – 1996; 2015 | Virginia Tech | Blacksburg, Virginia | Colony |
| Connecticut | conn | March 27, 1982 – 1998 | University of Connecticut | Storrs, Connecticut | Inactive |
| U.T.A. | uta | September 27, 1986 – 2000 | University of Texas at Arlington | Arlington, Texas | Inactive |
| T.A.M.U. | tamu | April 9, 1988 – 1999; 2007–2009 | Texas A&M University | College Station, Texas | Inactive |
| Michigan Tech | mtu | April 16, 1988 – 2006; 2012 | Michigan Technological University | Houghton, Michigan | Active |
| T.S.U. | tsu | April 15, 1989 – 2008 | Trine University | Angola, Indiana | Inactive |
| Akron | akr | November 2, 1991 – 1997 | University of Akron | Akron, Ohio | Inactive |
| Northern Illinois | niu | October 9, 1993 – 2006 | Northern Illinois University | DeKalb, Illinois | Inactive |
| Maryland B.C. | umbc | June 4, 2005 – 2019 | University of Maryland, Baltimore County | Catonsville, Maryland | Inactive |
| Houston | hou | April 19, 2008 – 2019 | University of Houston | Houston, Texas | Inactive |
| UC Berkeley | cal | April 24, 2010 – 2016 | University of California, Berkeley | Berkeley, California | Inactive |
| UCSan Diego | ucsd | February 11, 2011 | University of California, San Diego | San Diego California | Active |
| UNC Charlotte | char | April 30, 2011 | University of North Carolina at Charlotte | Charlotte, North Carolina | Active |
| Cal Poly Pomona | cpp | May 7, 2011 | California State Polytechnic University, Pomona | Pomona, California | Active |
| UCI | uci | September 29, 2012 | University of California, Irvine | Irvine, California | Active |
| Florida Atlantic | fau | September 7, 2013 – 2019 | Florida Atlantic University | Boca Raton, Florida | Inactive |
| Penn State Behrend | psb | February 28, 2015 | Penn State Erie, The Behrend College | Erie Pennsylvania | Active |
| Virginia Commonwealth | vcu | April 11, 2015 | Virginia Commonwealth University | Richmond Virginia | Active |
| Utah | utah | April 25, 2015 | University of Utah | Salt Lake City, Utah | Active |
| Clemson | clem | April 8, 2017 | Clemson University | Clemson, South Carolina | Active |
| Washington | uw | May 21, 2022 | University of Washington | Seattle, Washington | Active |
| Washington State | wsu | | Washington State University | Pullman, Washington | Colony |
* ↑ Chapter formed from the Transit Club, established in 1908.
* ↑ Chapter formed from the Transit Club, established in 1907.
* ↑ Chapter formed from the Civil Engineers Club, established in 1912.
* ↑ Chapter formed from the Kentucky Engineers Club, established in 1920. After going dormant, it reformed as a colony in 2004.
* ↑ Chapter formed from the Civil Engineer Men, established in 1920. After going dormant, it reformed as a colony in 2010.
* ↑ Chapter formed from the S.R.S. Club.
* ↑ Chapter formed from Chi Sigma Tau, established in 1921.
* ↑ Chapter formed from Scroll & Triangle, established in 1921 at the Armour Institute of Technology. Armour later became the Illinois Institute of Technology.
* ↑ Chapter formed from Alpha Epsilon Rho.
* ↑ Chapter formed from Quad L, established in 1924.
* ↑ Chapter formed from Gamma Epsilon.
* ↑ Chapter formed from the Grubstakers Club, established in 1902, at the Missouri School of Mines. The School of Mines later became the Missouri University of Science and Technology.
* ↑ Chapter formed from Sigma Epsilon, established in 1925.
* ↑ Chapter formed from Phi Kappa Phi, established in 1921.
* ↑ Chapter formed from Kappa Phi Gamma, established in 1926.
* ↑ Chapter formed from Gamma Theta Pi, established in 1922.
* ↑ Chapter formed from the Pyramid Club, established in 1926.
* ↑ Chapter formed from C.E.M., a local fraternity.
* ↑ Chapter formed from the Triangle Club, established in 1953.
* ↑ Chapter formed from the Triangle Club, established in 1956.
* ↑ Chapter formed from Delta Alpha Epsilon, established in 1964.
* ↑ Chapter formed by absorbing Sigma Delta Omega, established in 1956.
* ↑ Chapter formed from Nu Pi, established in 1981, at Tri-State University. Tri-State later became Trine University.

## Statistics
### New chapters by decade

| Decade | Total |
| 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 |
| 2020–present (as of 2023) | 1 |

### Chapters by region

| Region | Total |
| Northeast | 7 |
| Midwest | 27 |
| South | 14 |
| West | 8 |