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Daily Life

Enrollment (federal data)

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

Class Schedule

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

Dress Code

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

Student–Teacher Ratio (federal data)

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

Transportation

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

Enrollment (school-reported)

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

Full Campus

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

School Day

  • St. John XXIIINot Published
  • St. ThomasNot Published
  • O'ConnellClasses 8:00 AM - 3:20 PM
  • DuchesneNot Published
Commute from home
Tuition
$22,100

2026-27 rate

$27,900

2026-27 rate

$9,100

2025-26 rate (newest published)

$33,600

2026-27 rate · Upper School

What's included
Fees listed separately see fees
  • New Student Enrollment Fee: $500
  • Financial aid application (Clarity): $60 — 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
  • Registration fee: $450
  • Technology fee: $200
  • Sports fee: $150–$250 (per sport ($450 all-season package)) — optional
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
Sibling discount2nd student $17,680 ($4,420 off)$2,000/yr per sibling after the firstMulti-student assistance available (amount not published)Not Published
Lower school on campusHS onlyHS onlyHS only
Yes

PK3–12

Open houseNot postedDec 6, 2026Not postedNov 1, 2026
Required test
ISEE
ISEE

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

In-house placement test
ISEE
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 coursesNot posted21Not posted20
Enrollment43279180300
Student:Teacher11.3:19:14.5:18.1:1
Mass
Weekly

Daily Mass also offered

Monthly
Monthly
Not Published
Sports13 sports12 sports13 sports12 sports
Links

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