We are the Destination District for public schools in Central Texas. Our schools educate and support more than 49,000 student ... s, Pre-K through grade 12. Round Rock ISD is located in southern Williamson County and northwest Travis County and includes the City of Round Rock and portions of the City of Austin and the City of Cedar Park. The area covers 110 square miles encompassing high tech manufacturing and urban retail centers, suburban neighborhoods, and farm and ranch land. read more