Delcastle Technical High School
Wilmington, DE · High School · Grades 9-12
Delcastle Technical High School is a high school in Wilmington, DE with 1,585 students enrolled and a 42% proficiency rate. Part of New Castle County Vocational-Technical School District. NCES data from the U.S. Department of Education.
Delcastle Technical High School is a high school in Wilmington, DE, enrolling 1,585 students in grades 9-12 within the New Castle County Vocational-Technical School District. That headcount is above the 1,172-student average for schools in the district.
EDFacts assessment data shows 42% of students reaching grade-level proficiency in combined math and reading, near the middle of the national range. That tracks the 44% district average closely, within a few points either way. Against the 50% Delaware statewide average, the school sits 8 points lower.
Over the last three reported years the district proficiency rate this school inherits has risen by about 11 points. As a high school, it reports a 72% adjusted-cohort graduation rate, the share of first-time ninth-graders who earn a regular diploma within four years.
The student-teacher ratio is 12.4 to 1, below the U.S. average of roughly 16 to 1, which generally allows more adult attention per student.
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About This School
Delcastle Technical High School is a high school located in Wilmington, Delaware. The school serves 1,585 students in grades 9-12. The student-to-teacher ratio is 12.4:1.
According to EDFacts assessment data, 42% of students meet grade-level proficiency standards in combined math and reading. The school reports a 72% graduation rate.
Delcastle Technical High School is part of the New Castle County Vocational-Technical School District in Delaware.
How This School Compares
Delcastle Technical High School has 1,585 students enrolled, making it larger than the average school in New Castle County Vocational-Technical School District (1,172 students). Its 42% proficiency rate is 2 percentage points below the district average of 44%. Compared to the Delaware state average of 50%, the school performs 8 points lower. With a 12.4:1 student-teacher ratio, it offers smaller class sizes than the national average.
Other Schools in New Castle County Vocational-Technical School District
Frequently Asked Questions
Delcastle Technical High School has 1,585 students enrolled in grades 9-12. The student-to-teacher ratio is 12.4:1.
According to EDFacts data, 42% of students at Delcastle Technical High School meet grade-level proficiency standards in combined math and reading assessments.
Delcastle Technical High School has a 72% graduation rate, measuring the percentage of students who graduate within four years.
Delcastle Technical High School is part of the New Castle County Vocational-Technical School District in Wilmington, Delaware. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
Source: NCES Common Core of Data, 2026.