Founded in 1853, St. John XXIII Catholic School (SJ23) fosters a spiritually rich, academically challenging, and emotionally nurturing education for students from preschool through 8th grade.

Today, SJ23 provides a faith-based education option for approximately 170 students. Together, with the support of St. John XXIII Catholic Parish, our school functions as a parochial school option for students in northern Ozaukee County.

SJ23’s rigorous, integrated, hands-on philosophy promotes differentiated instruction, encourages creative expression, promotes critical thinking, and provides students with the opportunity to obtain skills needed to be successful, compassionate learners for the future.

In partnership with parents, our administration, faculty, and staff provide a Christ-centered environment that stresses basic academic skills and competencies, as well as the arts, music, and technology. We pride ourselves in producing graduates who are well prepared to excel in any high school they choose.


Our Mission

A Destination to SERVE. LEARN. LOVE. LEAD….as Disciples of Christ.

Welcome to St. John XXIII Catholic School – the finest K-8 Parochial School serving southeastern Wisconsin. Our mission is dedicated to providing a strong educational program that teaches Christian values, supports the education of the whole child, provides a safe environment and promotes preparing students for a life of continuous learning and service to the community.

At St. John XXIII we establish a Christ-centered environment where Christian values are taught, modeled, learned and lived by all members of the community. These values begin with a gifted, caring, and welcoming staff that shares a host of talents with its students and, in turn, encourages students to share their time, abilities and leadership with one another.

As you navigate our website, you’ll learn more about exciting programs where the creativity, uniqueness and self-esteem of each child is fostered and nurtured. Our students are taught the skills of critical thinking and problem-solving, while engaged in real-world experiences.

It is our goal to offer an excellent education where diversity of learning styles is honored and where individual differences are respected. Educating the complete child is paramount to his/her success.

Because learning takes place beyond the classroom, service to our community is an integral component of our program. We are preparing our students to be responsible citizens and stewards in a diverse and global community.

Thank you for your interest in St. John XXIII  Catholic School. We hope that what you see here will encourage you to visit our campuses, observe the sense of community and consider the excellent educational program we offer.

Please feel free to email or call me at 262-284-2682 to schedule a visit, or fill out this form. We would love to share this special place with you.

Kristine Klein
Principal, St. John XXIII Catholic School

Learn more about SJ23’s school expansion project and view construction updates as a part of the incorporation of our parish and school as ONE St. John XXIII (SJ23).

The SJ23 School Advisory Commission serves as an advisory body to the school principal or administrator. It assists with policy development, identification and expression of educational goals and objectives, budget planning, marketing, and public relations.

Meeting Minutes





School Advisory Commission Members


The SJ23 Finance Committee provides financial oversight for the school. It assists with budgeting and financial planning, financial reporting, and monitoring of adherence to the annual budget. This group also helps set long-range financial goals and develops strategies for accomplishing these goals. Our committee members are:

The SJ23 Home and School Association is a parent-run group that coordinates the majority of our family and student enrichment programs, teacher appreciation events, parent events, school clubs, and fundraising.

The Home and School Association meets on the third Thursday of the month at 7:00pm in the St. Mary’s Faculty Room. All parents are invited to attend.

  • Melissa Didier
  • Lauren Koch
    Vice President 2020
  • Jennifer Gaskell
  • Nicole Stewart
  • Rachel Lorier
    Past President

Our Annual Report highlights our accomplishments and activities; summarizes our financial performance over the past year; and allows us to recognize our generous donor families, individuals, and businesses.

View our 2018-2019 Annual Report.

View our 2017-2018 Annual Report.

View our 2016-2017 Annual Report.

Please consider a contribution to this year’s Annual Fund Drive. Our SJ23 Annual Fund is extremely important to our school’s continued strength and vitality. Every gift, no matter the size, makes a difference.

Port Washington has supported Catholic education since 1853 when the first Catholic school was established by Fr. F. X. Sailer. Since 1855, the Sisters of Notre Dame, the Sisters of the Dominican Motherhouse, and the Agnesian Sisters have all handled teaching duties at various times. In 1916, St. Mary’s School was built under the supervision of Monsignor Peter Holfeltz and served students in 1st through 10th grades. The original structure has undergone a number of expansions and remodels. The subsequent school was established to support St. Peter’s Parish in the 1960s and served students in 1st through 8th grades.

As enrollment declined in the 1980s, the school combined to form Port Washington Catholic School, which is now St. John XXIII Catholic School (SJ23). We provide instruction to children in grades preschool through 8th grade.

As an alumnus, please send us your news for our upcoming newsletter and help us share the great work you are doing in high school and beyond. Alumnus parents, please update us on your child’s successes and milestones. The success of our alumni is an important inspiration to current and future students. Submit your update on our Contact Us form.