Counties

Counties contained in the Research Triangle.   Three core counties: Wake, Durham, Orange   Raleigh–Durham–Cary Combined Statistical Area, per the U.S. Census Bureau   Other counties sometimes included in the Research Triangle

Depending on which definition of the Research Triangle region is used, as few as three or as many as 13 counties are included as part of the region. All of these counties when included hold a population of over 2,167,000 people.

Chatham ‡¶ Durham *‡¶ Franklin ‡¶ Granville ¶ Harnett ‡¶ Johnston ‡¶ Lee ¶ Moore ¶ Orange *‡¶ Person ‡¶ Vance ¶ Wake *‡¶ Warren ¶

Raleigh–Durham–Cary Combined Statistical Area Population (Census 2010) 1,749,525

Chatham County, NC (63,505) Durham County, NC (267,587) Franklin County, NC (60,619) Harnett County, NC (114,678) Johnston County, NC (168,878) Orange County, NC (133,801) Person County, NC (39,464) Wake County, NC (900,993)