Research Triangle

Geographic region of North Carolina, U.S. Combined Statistical Area in North Carolina, United StatesResearch TriangleCombined Statistical AreaRepresentations of the Research Triangle (from top to bottom): skyline of Raleigh, skyline of Durham, and the Old Well in Chapel HillMap of Raleigh–Durham–Cary, NC CSA Raleigh–Cary MSA Durham–Chapel Hill MSA Anderson Creek µSA Sanford µSA Henderson µSA City of Raleigh City of Durham Town of Chapel Hill Country United StatesState North CarolinaLargest cityRaleighOther citiesDurhamChapel HillCaryArea • Total4,766 sq mi (12,340 km2)Population (2020) • Density442/sq mi (171/km2) • CSA2,106,463 (32nd)GDP • Raleigh–Durham–Cary (CSA)$183.624 billion (2022) • Raleigh (MSA)$119.675 billion (2022) • Durham-Chapel Hill (MSA)$63.950 billion (2022)Time zoneUTC−5 (EST) • Summer (DST)UTC−4 (EDT)Area codes919, 984 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