Building upon previous research on outmigration, this report measures the gaps in the New Jersey Statewide Data System (NJSDS) that limit the ability to track New Jersey high school graduates who pursue higher education and/or employment opportunities in other states. This study supplements administrative data from state agencies in NJSDS with a time-limited National Student Clearinghouse extract and AlumniFinder data to examine postsecondary enrollment outside of the state and examine where graduates relocate afterward. In addition to presenting key outcomes, this report illustrates that supplementing administrative data from state agencies with additional data sources like National Student Clearinghouse and AlumniFinder is necessary for understanding the complex nuances of migration patterns for high school graduates in New Jersey.