Geographical residence vs State residency

In the case of Duke University, although private, residents of North and South Carolina are given an admissions boost.

" Students from the Carolinas receive special
consideration in our admissions process"

https://www.richlandone.org/cms/lib/SC02209149/Centricity/Domain/709/Information%20for%20North%20and%20South%20Carolina%20Students%20-%20Duke%20Undergraduate%20Admissions.pdf