* Enrollment: This is the most common measure. However, enrollment numbers fluctuate year to year. Finding consistently updated, reliable data across all North Carolina high schools is challenging.
* Physical size (building): This would involve comparing square footage, which is not readily available publicly for all schools.
Therefore, I cannot give you a definitive answer to which high school is the largest in North Carolina without access to constantly updated, comprehensive databases of all high school sizes across the state. You'd likely need to contact the North Carolina Department of Public Instruction or conduct extensive research across individual school district websites.