[4][5][6] As the county's only vocational-technical high school, it was overwhelmingly popular; by 1971, they were receiving applications from more than three times the number of students they had capacity for.

[7] By 1973, the county began planning three additional vocational-technical schools to help handle the extreme interest in Delcastle.

[9] Ninth grade students have the opportunity to do rotations in different career areas so they can find the best fit.

[10] There are 24 career programs separated into six distinct areas at Delcastle:[11] Delcastle also has partnerships with higher education institutions such as Delaware Technical and Community College, University of Delaware, Wilmington University so students can earn dual enrollment credits as well.

[12] Delcastle is part of the Delaware Interscholastic Athletic Association and compete in Blue Hen Conference, Flight "A".