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Daily Life

Enrollment (federal data)

  • Duchesne300 (Upper School 9-12 (NCES 2023-24: 89/74/65/72). Total campus 761.)
  • St. ThomasNot Published
  • St. John XXIII432 (NCES PSS 2023-24. Katy campus.)
  • O'Connell80 (NCES PSS 2023-24. Island campus; 4.5:1 student-teacher ratio.)

Class Schedule

  • DuchesneSix-term modular "MOD" schedule — 80-minute classes, 3-4 courses per mod, 29-30 days/mod
  • St. Thomas7:50 AM - 3:10 PM modified block — four 80-minute classes, 35-min advisory, 55-min lunch
  • St. John XXIIINot Published
  • O'ConnellNot Published

Dress Code

  • DuchesneNot Published
  • St. ThomasCollared shirt + khakis + dress shoes; dress days add white button-up, red tie, blue blazer
  • St. John XXIIISue Mills uniforms; red or black logo sweater/vest/cardigan
  • O'ConnellNot Published

Student–Teacher Ratio (federal data)

  • Duchesne8.1:1 (NCES 2023-24, campus-wide)
  • St. ThomasNot Published
  • St. John XXIII11.3:1 (NCES 2023-24: 432 / 38.1 FTE)
  • O'ConnellNot Published

Transportation

  • DuchesneNot Published
  • St. ThomasNo bus service; CarpooltoSchool partnership; parking garage (permit + fee)
  • St. John XXIIINot Published
  • O'ConnellPaid van stops in Dickinson and La Marque (mainland commuters)

Enrollment (school-reported)

  • DuchesneNot Published
  • St. Thomas791 (2025-26; no NCES record exists for this school)
  • St. John XXIIINot Published
  • O'ConnellNot Published

Full Campus

  • DuchesnePK3–12 (all-girls); Upper School is grades 9–12
  • St. ThomasNot Published
  • St. John XXIIINot Published
  • O'ConnellNot Published

School Day

  • DuchesneNot Published
  • St. ThomasNot Published
  • St. John XXIIINot Published
  • O'ConnellClasses 8:00 AM - 3:20 PM
Commute from home
Tuition
$33,600

2026-27 rate · Upper School

$27,900

2026-27 rate

$22,100

2026-27 rate

$9,100

2025-26 rate (newest published)

What's included
Fees listed separately see fees
  • New Student Fee: $1,500
  • Enrollment deposit: $1,000
  • Technology fee (Grade 9): $2,600
  • Textbooks: $350 (approximate, Upper School)
  • Grade 10 College Tour: $500 (grade 10)
  • Graduation fee: $600 (seniors)
  • Class trips: $175–$2,800 — optional
  • AP exams: $100–$200 (per exam) — optional
  • Athletics fee: $150–$300 (per sport) — optional
Included in tuition see list
  • Laptop & technology

Charged separately:

  • Application fee: $75
  • Registration fee: $700
  • Camp Aquinas (freshman retreat): $650 (freshmen)
  • Class retreat: $325 (returning/transfer students)
  • Books: $550
  • Athletics fee: $250 (per sport) — optional
  • AP exam: $99 (per course) — optional
Fees listed separately see fees
  • New Student Enrollment Fee: $500
  • Financial aid application (Clarity): $60 — optional
Fees listed separately see fees
  • Registration fee: $450
  • Technology fee: $200
  • Sports fee: $150–$250 (per sport ($450 all-season package)) — optional
Sibling discountNot Published$2,000/yr per sibling after the first2nd student $17,680 ($4,420 off)Multi-student assistance available (amount not published)
Lower school on campus
Yes

PK3–12

HS onlyHS onlyHS only
Open houseNov 1, 2026Dec 6, 2026Not postedNot posted
Required test
ISEE
ISEE

Offered on campus: Nov 14, 2026 · Jan 9, 2027

ISEE
In-house placement test
Application deadlineNot postedJan 15, 2027Not postedNot posted
Decision dateNot postedMar 5, 2027Not postedNot posted
Financial aid
Need-based + Merit
Need-based + Merit
Need-based + Merit
Need-based + Merit
AP courses2021Not posted3
Enrollment30079143280
Student:Teacher8.1:19:111.3:14.5:1
MassNot Published
Monthly
Weekly

Daily Mass also offered

Monthly
Sports12 sports12 sports13 sports13 sports
Links

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