The Research Triangle, or simply The Triangle, are both common nicknames for a Combined Statistical Area in the Piedmont region of the U.S. state of North Carolina. Anchored by the cities of Raleigh and Durham and the town of Chapel Hill, the region is home to three major research universities: North Carolina State University, Duke University, and the University of North Carolina at Chapel Hill, respectively. The "Triangle" name originated in the 1950s with the creation of Research Triangle Park located between the three anchor cities, which is the largest research park in the United States and home to several high tech companies.
Both Raleigh and Durham have their own separate Metropolitan statistical areas (MSA). However, the eleven-county region, officially named the Raleigh–Durham–Cary, NC Combined Statistical Area by the Office of Management and Budget, comprises the Raleigh–Cary, Durham–Chapel Hill, Henderson, Anderson Creek, and Sanford, NC statistical areas. The 2020 census put the combined statistical area (CSA) population at 2,242,324, making it the second-largest combined statistical area in North Carolina, behind the Charlotte area. The Raleigh–Durham television market includes a broader 24-county area which includes Fayetteville, North Carolina, and has a population of 2,726,000 persons.Nielsen Station Index, Viewers in Profile, Raleigh–Durham (Fayetteville), NC May 2010 Most of the Triangle is part of North Carolina's first, second, fourth, ninth, and thirteenth congressional districts.
The region is sometimes confused with the Piedmont Triad, which is a North Carolina region adjacent to and directly west of the Triangle comprising Greensboro, Winston-Salem, and High Point, among other cities. Both the Research Triangle and the Piedmont Triad form part of the Piedmont Crescent, an urbanized region of the state that includes the city of Charlotte.
Definitions
The Research Triangle encompasses between 3 to 16 counties depending on the definition used. The three core counties of Wake, Durham, and Orange are home to research universities.
Combined Statistical Area As of July 21, 2023, the US Office of Management and Budget (OMB) delineated the Raleigh–Durham–Cary Combined Statistical Area as consisting of two metropolitan and three micropolitan statistical areas. Those five statistical areas in turn are defined as consisting of a total of ten counties. The statistical areas and their constituent counties are outlined in the following tables:
Statistical Areas Statistical Area2025 estimate2020 CensusChangeAreaDensityRaleigh–Cary, NC Metropolitan Statistical AreaDurham–Chapel Hill, NC Metropolitan Statistical AreaAnderson Creek, NC Micropolitan Statistical AreaSanford, NC Micropolitan Statistical AreaHenderson, NC Micropolitan Statistical AreaTotal
Counties CountySeatStatistical Area2025 estimate2020 CensusChangeAreaDensityWakeRaleighRaleigh–Cary DurhamDurhamDurham–Chapel Hill JohnstonSmithfieldRaleigh–Cary OrangeHillsboroughDurham–Chapel Hill HarnettLillingtonAnderson CreekChathamPittsboroDurham–Chapel Hill FranklinLouisburgRaleigh–Cary LeeSanfordSanfordVanceHendersonHendersonPersonRoxboroDurham–Chapel HillTotal
Prior to September 2018, the OMB used the name Raleigh–Durham–Chapel Hill, NC Combined Statistical Area, and several additional counties were included. The Dunn µSA (Harnett County) and Sanford µSA (Lee County) were moved to the Fayetteville–Sanford–Lumberton Combined Statistical Area, while the Oxford µSA (Granville County) was folded into the Durham–Chapel Hill Metropolitan Statistical Area. The Raleigh Metropolitan Statistical Area was also renamed the Raleigh–Cary Metropolitan Statistical Area.
Regional partnerships The members of the Research Triangle Regional Partnership are: Chatham Durham Franklin Granville Harnett Johnston Lee Nash Orange Person Wake Warren Wilson
All counties in North Carolina are in one of 16 regional councils which provide programs and services to local governments. The Triangle J Council of Governments includes Chatham, Durham, Johnston, Lee, Moore, Orange, and Wake Counties. The northern Triangle counties of Person, Granville, Franklin, Vance, and Warren are part of the Kerr-Tar Regional Council of Governments.
Cities
The Triangle region, as defined for statistical purposes as the Raleigh–Durham–Cary CSA, comprises nine counties, although the U.S. Census Bureau divided the region into two metropolitan statistical areas and one micropolitan area in 2003. The Raleigh-Cary metropolitan area comprises Wake, Franklin, and Johnston Counties; the Durham-Chapel Hill metropolitan area comprises Durham, Orange, Chatham, Granville, and Person Counties; and the Henderson micropolitan area comprises Vance County.
Some area television stations define the region as Raleigh–Durham–Fayetteville. Fayetteville is more than from Raleigh, but is part of the Triangle television market. Rank City / town County 2020 Census 2010 Census Change1 Raleigh Wake County / Durham County 2 Durham Durham County / Wake County 3 Cary Wake County / Chatham County 4 Chapel Hill Orange County / Durham County / Chatham County 5 Apex Wake County 6 Wake Forest Wake County / Franklin County 7 Holly Springs Wake County 8 Fuquay-Varina Wake County 9 Garner Wake County 10 Morrisville Wake County / Durham County 11 Clayton Johnston County / Wake County 12 Carrboro Orange County 13 Knightdale Wake County 14 Mebane Alamance County / Orange County 15 Henderson Vance County
Education Public secondary education in the Triangle is similar to that of the majority of the state of North Carolina, in which there are county-wide school systems (the exception is Chapel Hill-Carrboro City Schools within Orange County but apart from Orange County Schools). Based in Cary, the Wake County Public School System, which includes the cities of Raleigh and Cary, is the largest school system in the state of North Carolina and the 15th-largest in the United States, with average daily enrollment of 159,949 as of the second month of the 2016–17 school year. Other larger systems in the region include Durham Public Schools (about 33,000 students) and rapidly growing Johnston County Schools (about 31,000 students).
Institutions of higher education
Campbell University Central Carolina Community College Duke University Durham Technical Community College ECPI University, Raleigh campus Louisburg College Meredith College Montreat College's School of Professional and Adult Studies North Carolina Central University North Carolina State University Piedmont Community College Shaw University Skema Business School, Raleigh campus Southeastern Baptist Theological Seminary and The College at Southeastern St. Augustine's College Strayer University, Raleigh campus University of North Carolina at Chapel Hill Vance-Granville Community College Wake Technical Community College William Peace University
Sports
College sports With the significant number of universities and colleges in the area and the relative absence of major league professional sports, NCAA sports are very popular, particularly those sports in which the Atlantic Coast Conference participates, most notably basketball.
The Duke Blue Devils (representing Duke University in Durham), NC State Wolfpack (representing North Carolina State University in Raleigh), and North Carolina Tar Heels (representing the University of North Carolina at Chapel Hill) are all members of the ACC. Rivalries among these schools are very strong, fueled by proximity to each other, with annual competitions in every sport. Adding to the rivalries is the large number of graduates the high schools in the region send to each of the local universities. It is very common for students at one university to know many students attending the other local universities, which increases the opportunities for "bragging" among the schools. The four ACC schools in the state, Duke, North Carolina, North Carolina State, and Wake Forest University (the last of which was originally located in the town of Wake Forest before moving to Winston-Salem in 1956), are referred to as Tobacco Road by sportscasters, particularly in basketball. All four teams consistently produce high-caliber teams . Each of the Triangle-based universities listed has won at least two NCAA Basketball national championships.
Three historically black colleges, including recent Division I arrival North Carolina Central University and Division II members Saint Augustine's University and Shaw University also boost the popularity of college sports in the region.
Other colleges in the Triangle that field intercollegiate teams include Campbell University, Meredith College, and William Peace University.
The Triangle will host the World University Summer Games in 2029.
Professional sports
The region has only one professional team of the four major sports, the Carolina Hurricanes of the National Hockey League, based in Raleigh. Since moving to the Research Triangle region from Hartford, Connecticut, they have enjoyed great success, including winning two Stanley Cup championships, most recently in June 2026.
Cary is home to the North Carolina Courage, who compete in the National Women's Soccer League. They relocated to the Triangle from western New York in 2017 and experienced immediate success, winning the NWSL Shield in their first three years. They play in WakeMed Soccer Park, which has also hosted The Soccer Tournament since 2023. The complex was previously home to North Carolina FC, who competed in the USL Championship; they are currently dormant pending an application to join the USL Premier in 2028.
With limited top-level professional sports options, minor league sports are quite popular in the region. The region is home to two Minor League Baseball teams: the Durham Bulls and the Wilson Warbirds. The Bulls are the Triple-A affiliate of the Tampa Bay Rays, while the Warbirds are the Single-A affiliate of the Milwaukee Brewers. They previously played in Zebulon as the Carolina Mudcats for many years before relocating to Wilson in 2026.
Durham is also home to the Carolina Blaze of the Athletes Unlimited Softball League.
Team League Sport Venue (capacity) Carolina Hurricanes NHL Hockey Lenovo Center (18,680) Durham Bulls IL (AAA) Baseball DBAP (10,000) North Carolina Courage NWSL (D1) Soccer WakeMed Soccer Park (10,000) Carolina Blaze AUSL Softball Smith Family Stadium (900) Carolina Flyers AUDL Ultimate WakeMed Soccer Park (10,000) / Cardinal Gibbons High School
The area also had a team in the fledgling World League of American Football – however, the Raleigh–Durham Skyhawks, coached by Roman Gabriel, did not exactly cover themselves in glory; they lost all 10 games of their inaugural (and only) season in 1991. The team folded after that, being replaced in the league by the Ohio Glory, which fared little better at 1–9, ultimately suffering the same fate – along with the other six teams based in North America – when the league took a two-year hiatus, returning as a six-team all-European league in 1995. The Orange County Speedway in Rougemont hosts stock car racing events including the Pro All Stars Series, the CARS Super Late Model Tour and the CARS Late Model Stock Tour.
Economy