Penn (William) High School
New Castle, DE · High School · Grades 9-12
Penn (William) High School is a high school in New Castle, DE with 2,239 students enrolled and a 59% proficiency rate. Part of Colonial School District. NCES data from the U.S. Department of Education.
Penn (William) High School is a high school in New Castle, DE that enrolls 2,239 students in grades 9-12, putting it among the larger public campuses in the Colonial School District. That headcount is above the 652-student average for schools in the district.
EDFacts assessment data puts 59% of students at or above grade level in combined math and reading, a little above the national midpoint where roughly half of tested students clear the bar. That is 6 points above the 53% average for the Colonial School District. Against the 50% Delaware statewide average, the school sits 9 points higher.
Over the last three reported years the district proficiency rate this school inherits has fallen by about 11 points. As a high school, it reports a 83% adjusted-cohort graduation rate, the share of first-time ninth-graders who earn a regular diploma within four years.
The student-teacher ratio is 18.1 to 1, above the U.S. average of roughly 16 to 1.
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About This School
Penn (William) High School is a high school located in New Castle, Delaware. The school serves 2,239 students in grades 9-12. The student-to-teacher ratio is 18.1:1.
According to EDFacts assessment data, 59% of students meet grade-level proficiency standards in combined math and reading. The school reports a 83% graduation rate.
Penn (William) High School is part of the Colonial School District in Delaware.
How This School Compares
Penn (William) High School has 2,239 students enrolled, making it larger than the average school in Colonial School District (652 students). Its 59% proficiency rate is 6 percentage points above the district average of 53%. Compared to the Delaware state average of 50%, the school performs 9 points higher.
Frequently Asked Questions
Penn (William) High School has 2,239 students enrolled in grades 9-12. The student-to-teacher ratio is 18.1:1.
According to EDFacts data, 59% of students at Penn (William) High School meet grade-level proficiency standards in combined math and reading assessments.
Penn (William) High School has a 83% graduation rate, measuring the percentage of students who graduate within four years.
Penn (William) High School is part of the Colonial School District in New Castle, 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.