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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.

Best Delaware ²ÝÁñÉçÇø High Schools Belonging to Middle States Association of Colleges and Secondary Schools (2025-26)

For the 2025-26 school year, there are 7 private high schools belonging to Middle States Association of Colleges and Secondary Schools serving 4,452 students in Delaware. You can also find more schools membership associations in Delaware.
The top ranked private high schools belonging to Middle States Association of Colleges and Secondary Schools in Delaware include Salesianum School, Tower Hill School, and St. Elizabeth School.
The average acceptance rate is 81%, which is lower than the Delaware private high school average acceptance rate of 87%.
71% of private high schools belonging to Middle States Association of Colleges and Secondary Schools in Delaware are religiously affiliated (most commonly Catholic and Christian).

Top Ranked ²ÝÁñÉçÇø High Schools Belonging to Middle States Association of Colleges and Secondary Schools in Delaware (2025-26)

School
Location
Quick Facts
Red Lion Christian Academy
Red Lion Christian Academy Photo - ELEMENTARY PLAYGROUND
(Christian)
1390 Red Lion Road
Bear, DE 19701
(302) 834-2526
Gr: NS-12 | 1,002 student Avg. class size: 20 students Sports: 13 | Extracurrculars: 28 Tuition & acceptance rate listed
St. Elizabeth School
St. Elizabeth School Photo
(Catholic)
1500 Cedar St
Wilmington, DE 19805
(302) 656-3369
Gr: PK-12 | 433 students Avg. class size: 20 students Sports: 14 Tuition listed
Saint Mark's High School
Saint Mark's High School Photo
(Catholic)
(10)
2501 Pike Creek Road
Wilmington, DE 19808
(302) 757-8721
Gr: 9-12 | 716 students Avg. class size: 20 students Sports: 17 | Extracurrculars: 34 Tuition listed
Salesianum School
Salesianum School Photo
All-boys (Catholic)
(1)
1801 N Broom Street
Wilmington, DE 19802
(302) 654-2495
Gr: 9-12 | 930 students Avg. class size: 18 students Sports: 21 | Extracurrculars: 60 Tuition & acceptance rate listed
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
Gr: NS-12 | 486 students Avg. class size: 12 students Sports: 15 | Extracurrculars: 9 Tuition listed
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
Gr: NS-12 | 849 students Avg. class size: 15 students Sports: 17 | Extracurrculars: 24 Tuition & acceptance rate listed
Towle Institute
Alternative School (Christian)
199 Polly Drummond Hill Road
Newark, DE 19711
(302) 993-1408
Gr: 4-12 | 36 students Avg. class size: 14 students Tuition listed

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