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 205 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 Lower Campus serves students in preschool through 4th grades and our Upper Campus serves students in 5th through 8th grades.

Learn more about SJ23’s history, mission, and philosophy by reading below or contacting us. >>

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 2016-2017 Annual Report.

Our Mission

Our mission at SJ23 is to provide a child-centered, faith-filled learning community where Catholic values are lived and taught. Our commitment to academic excellence promotes student success. Every child is nurtured, challenged, and known as an individual.

Our Philosophy

As a school community of committed parents, teachers, administration, and staff, we believe:

  • Each student is an individual, and we must provide for his or her individual needs.
  • Our Catholic identity is a living part of our daily experience.
  • Our primary purpose is to provide for the spiritual, academic, physical, social, and emotional needs of the children we serve.
  • Our school, by design, strives to meet the needs of our combined Catholic community in Port Washington.
  • Our school is an integral part of and shares the educational mission of our city, county, the Archdiocese of Milwaukee, and the state of Wisconsin.
  • The Kingdom of God is present among us and together we are in the process of making that Kingdom an ever-present reality for ourselves and for the world in which we live.
  • We must strive to be a model of academic excellence and faith development.

Our Values

  • A personalized and well-rounded education.
  • High academic standards.
  • Parental involvement in SJ23 as a vital link in the education of our students.
  • The individual worth of each person.
  • The opportunity to provide an educational choice in our community.

Welcome to St. John XXIII Catholic School (SJ23)!

Our entire school community is committed to providing the best Catholic education possible for our students. While preparing students for higher education and life beyond college, we create a community where service, excellence, discipleship, and community are part of our everyday life. Our high academic standards, supported by strong moral values, prepare our students for life-long success in our global society.

Our families have made a commitment to raise their children in the Catholic faith, and that commitment has led them here to SJ23. Sending their children to SJ23 ensures that he or she will be educated in a faith-filled environment and will learn to live as Jesus did—with love and compassion for everyone.

SJ23 works to build a strong foundation in faith and community service. As a school we pray daily, participate in weekly school Masses, celebrate the sacraments, immerse ourselves in the Catholic faith and traditions, and incorporate service opportunities into our daily lives. SJ23 students are encouraged to participate in a balance of academic, leadership, sports, social, and service activities as we believe it is critical to nurture the whole child.

We believe families play a key role in the education of their children. We welcome the active participation of families in all of our school experiences. Our various school committees include a dedicated group of parents that contribute a wealth of knowledge and skills towards supporting our school goals.

Our vision for the school is to be a “destination to serve, learn, love, lead…as disciples of Christ.” It is my privilege to lead a dedicated faculty as we empower our students to be curious and creative seekers of knowledge, faith-filled Christians, responsible citizens, and critical thinkers.

I welcome the opportunity to meet with you personally and invite you to come and visit SJ23!

Kristine Klein
Principal, St. John XXIII Catholic School

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.

  • Nicole Styles
    Past President

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). The Lower Campus provides instruction to children in grades preschool through 4th grades and the Upper Campus functions as our middle school campus for students in 5th through 8th grades.

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.