St. Mark's High School Photo

Top 10 Best Delaware Private Schools Belonging to National Association of Independent Schools (NAIS) (2025)

For the 2025 school year, there are 17 private schools belonging to National Association of Independent Schools (NAIS) serving 5,701 students in Delaware. You can also find more schools membership associations in Delaware.
The top ranked private schools belonging to National Association of Independent Schools (NAIS) in Delaware include Tower Hill School, Archmere Academy, and Albert Einstein Academy.
The average tuition cost is $25,716, which is higher than the Delaware private school average tuition cost of $13,288.
59% of private schools belonging to National Association of Independent Schools (NAIS) in Delaware are religiously affiliated (most commonly Catholic and Amish).

Top Ranked Private Schools Belonging to National Association of Independent Schools (NAIS) in Delaware (2025)

School
Location
Grades
Students
Albert Einstein Academy
Albert Einstein Academy Photo - Kindergarteners are Scientists!
Special Program Emphasis (Jewish)
(9)
101 Garden Of Eden Rd
Wilmington, DE 19803
(302) 478-5026
Grades: K-5
| 35 students
Wilmington Friends School
Wilmington Friends School Photo - Technology, including the one-to-one program for all students preschool - 12th grade, supports collaborative learning at Friends. The point is not the hardware but what it makes possible in teaching and engaging students in 21st century skills.
(Friends)
(1)
101 School Road
Wilmington, DE 19803
(302) 576-2900
Grades: NS-12
| 687 students
Centreville Layton School
Centreville Layton School Photo - Beautiful campus
Alternative School
6201 Kennett Pike
Wilmington, DE 19807
(302) 571-0230
Grades: K-12
| 83 students
Archmere Academy
Archmere Academy Photo
(Catholic)
(7)
3600 Philadelphia Pike
Claymont, DE 19703
(302) 798-6632
Grades: 9-12
| 514 students
The Independence School
The Independence School Photo
(2)
1300 Paper Mill Road
Newark, DE 19711
(302) 239-0332
Grades: NS-8
| 433 students
St. Andrew's School
(Episcopal)
350 Noxontown Rd
Middletown, DE 19709
(302) 378-7120
Grades: 9-12
| 316 students
St. Annes Episcopal School
St. Annes Episcopal School Photo
(Episcopal)
(1)
211 Silver Lake Road
Middletown, DE 19709
(302) 378-3179
Grades: NS-8
| 294 students
St. Mark's High School
St. Mark's High School Photo
(Catholic)
(10)
2501 Pike Creek Road
Wilmington, DE 19808
(302) 757-8704
Grades: 9-12
| 716 students
Sanford School
Sanford School Photo
(2)
6900 Lancaster Pike
Hockessin, DE 19707
(302) 235-6503
Grades: NS-12
| 685 students
The Tatnall School
The Tatnall School Photo - Tatnall's 110-acre campus is located just west of Wilmington in Greenville, Delaware. Housing a National Wildlife Federation-accredited schoolyard habitat, five outdoor classrooms and bordering the Downs Nature Conservancy, the spacious campus provides expansive playing fields and opportunities for outdoor environmental study.
(13)
1501 Barley Mill Road
Wilmington, DE 19807
(302) 892-4296
Grades: NS-12
| 486 students
Tower Hill School
Tower Hill School Photo - Tower Hill School resides on a 44-acre campus with state-of- the-art athletic facilities and impressive academic and arts areas.
2813 W 17th Street
Wilmington, DE 19806
(302) 575-0550
Grades: NS-12
| 860 students
Ursuline Academy, Lower
Ursuline Academy, Lower Photo
(Catholic)
(10)
1106 Pennsylvania Avenue
Wilmington, DE 19806
(302) 658-7158
Grades: K-5
| 208 students
Coopers Corner School
(Amish)
2183 Honeysuckle Rd
Camden Wyoming, DE 19934
(302) 674-2374
Grades: 1-8
| 25 students
The Pilot School
The Pilot School Photo - Our 50 acre campus provides ample opportunities for our students to learn outside the traditional school walls. Surrounded by 2,000 acres of parkland, our campus was built with nature at its center and this is woven into the curriculum and into free time.
Special Education School
(4)
208 Woodlawn Road
Wilmington, DE 19803
(302) 478-1740
Grades: PK-8
| 144 students
Rose Valley School
(Amish)
361 Rose Valley School Rd
Dover, DE 19904
(302) 734-7647
Grades: 1-8
| 30 students
Southern Meadow School
(Amish)
2008 Jebb Rd
Camden Wyoming, DE 19934
(302) 697-2588
Grades: 1-8
| 23 students
Wilmington Montessori School
Wilmington Montessori School Photo - Primary (3- to 6-year-old) Program - Preschool and Kindergarten - Students work together to create the Montessori Pink Tower.
Montessori School
(1)
1400 Harvey Road
Wilmington, DE 19810
(302) 475-0555
Grades: NS-8
| 162 students

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