Mullen High School is a private, co-educational school in southwest Denver which provides a Catholic, college-prep curriculum since 1931. Our Lasallian philosophy of educating is dedicated to exemplary teaching, scholastic rigor and outstanding care for all students.

Quick Stats (2021-22)

  • Top Ranked CO School
  • Grades: 9-12
  • Students: 850 students
  • Yearly Tuition: $15,900
  • Application Deadline: Dec. 19 / rolling

Top Rankings

Mullen High School ranks among the top 20% of private schools in Colorado for:

Sports offered
School History

School Overview

Religious Affiliation
Grades Offered
Grades 9-12
Year Founded

Student Body

Total Students
850 students
Student Body Type
% Students of Color
State avg.: 25%
Students by Grade
Mullen High School Student By Grade

Academics and Faculty

Total Classroom Teachers
58 teachers
Student : Teacher Ratio
National avg.: 13:1
Number of AP Courses
16 courses
Classroom Dress Code
(Dress code is enforced.)

Tuition and Acceptance Rate

Admission Deadline
Dec. 19 / rolling
Yearly Tuition Cost
Tuition Notes
Includes the $400 registration fee.
% on Financial Aid
Admissions Director
Mr. Frank Cawley


School Reviews

Mullen High School has been doing an incredible job accommodating the students and teachers during the COVID 19 pandemic. It has been tough, but I appreciate the work they are doing to keep us safe and bringing our community back together.
- Posted by

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Quick Stats (2021-22)

  • Top Ranked CO School
  • Grades: 9-12
  • Students: 850 students
  • Yearly Tuition: $15,900
  • Application Deadline: Dec. 19 / rolling

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Did You Know?

The average private school tuition in Denver, CO is $13,368 for elementary schools and $16,143 for high schools (read more about average private school tuition across the country).
The average acceptance rate in Denver, CO is 87% (read more about average acceptance rates across the country).

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