The U.S. Census Bureau, American Community Survey, estimates population demographics annually. After applying parameters for citizenship and school enrollment to the 2006 ACS data, the data revealed 12,650 noncitizens in North Carolina enrolled in public undergraduate institutions. "Non-U.S. Citizens" are either in the country legally (in this case, as holders of a student visa) or illegally. The chart below illustrates the breakdown of these students based on data reported by the UNC and N.C. community college systems. See below for methodology.

Methodology
Data extracted from the 2006 American Community Survey. Individuals included in the data set must be:
Data regarding foreign undergraduates is self-reported by the UNC and NCCCS systems and is presumed to include foreign students who hold a student visa and are in the United States legally.
Click here for the American Community Survey's methodology.
Assumptions & Calculations
Costs to the state: Registering 10,000 out-of-state students as in-state students costs North Carolina taxpayers $36 million.
This calculation makes the following assumptions:
Community college enrollment: We assume that the majority of the 10,000 students are enrolled at community colleges rather than in the UNC system. This assumption is based on the following:
Data Sources
U.S. Census Bureau, 2006 American Community Survey, data extracted via the Census Bureau's Data Ferret application
North Carolina Community College System Curriculum Student Information, 2005-06 (pdf)
UNC Headcount and Percent of Foreign Degree Credit Headcount Enrollment, Fall 2006, Table 18 (pdf)