Jacksonville, North Carolina, is a city in Onslow County, North Carolina, United States. As of the 2010 United States census, the population stood at 70,145, which makes Jacksonville the 14th largest city in North Carolina.[3] Jacksonville is the principal city of and is included in the Jacksonville, North Carolina metropolitan area. Demographically, Jacksonville is the youngest city in the United States with an average age of 22.8 years old, which can be attributed to the large military presence.[4]

It is the county seat of Onslow County,[5] and the home of the United States Marine Corps' Marine Corps Base Camp Lejeune and Marine Corps Air Station New River. Jacksonville is located adjacent to North Carolina's Southern Outer Banks (SOBX) area.

Reference: http://en.wikipedia.org/wiki/Jacksonville%2C_North_Carolina