#1 Fastest-Growing Private Schools in New Castle County, DE
Islamic Academy of Delaware
Islamic school · Grades Pre-K–8
Enrollment up 110% in about a decade
Newark, DE
A+Overall grade124 students5 students per teacher
2026 lists
Fastest-Growing Private Schools in New Castle County, DE
Private schools in New Castle County, DE whose enrollment has grown the most over the past decade. Top 5 of 5 schools.
#2 Fastest-Growing Private Schools in New Castle County, DE
Urban Promise School
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 67% in about a decade
Wilmington, DE
AOverall grade85 students6 students per teacher
#3 Fastest-Growing Private Schools in New Castle County, DE
Aquinas Academy
Independent Catholic school · Grades K–12
Enrollment up 50% in about a decade
Bear, DE
B+Overall grade75 students9 students per teacher
#4 Fastest-Growing Private Schools in New Castle County, DE
Fairwinds Christian School
Baptist school · Grades Pre-K–12
Enrollment up 30% in about a decade
Bear, DE
B+Overall grade173 students12 students per teacher
#5 Fastest-Growing Private Schools in New Castle County, DE
Nativity Preparatory School of Wilmington
Diocesan school · Grades 5–8
Enrollment up 26% in about a decade
Wilmington, DE
A+Overall gradeAll boys53 students8 students per teacher
From official public records, updated October 2026.