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Birdville Independent School District Welcome to the BISD Family. Open Enrollment Information Open Enrollment is a process through which indistrict and outofdistrict students may apply to a Birdville ISD campus other than the one they are zoned to attend based on their residential address. Applications are considered on a casebycase basis and require approval by the campus principal and an administrator in the Student Services Department. Click the picture for more information.