Admission Inquiry 
Contact us 
WELCOME TO
St. John XXIII Catholic School
St. John XXIII Catholic School (SJ23) provides a foundation of Catholic values and academic excellence for its students in preschool through 8th grade. Our faculty and staff are dedicated to building a strong academic, social, emotional, and spiritual foundation for our students.
Learn more about our Catholic School Community
“I am beyond grateful for what St. John XXIII and the entire staff has done for my family. My kids would not be in the places they are if it weren’t for the dedication and love of the teachers and staff. THANK YOU ALL.”
– Current Parent
WE ARE EXCITED TO MEET YOUR FAMILY…
Choosing the right educational option for your child is one of the most important decisions you will make. It’s important that your child’s school is an educational partner with like-minded values and goals, dedicated to helping your child reach his or her social, emotional, intellectual, physical, and spiritual potential. If you are interested in becoming part of our school community, we welcome you to contact us today!
Quick links to help you
STAY CONNECTED
EXTRACURRICULAR CLUBS
Clubs meet from 3:30-4:30 PM and are held in two sessions:
3D Printing & Coding
Amazing Aspiring Artists
Bucket Drumming
Chess
Flag Football
LEGO Club
Sign Language
Soccer
Strategic Games
Volleyball
Watercolor Painting
Why St. John XXIII Catholic School?
Check us out on Facebook!
Nothing tastes better than something you’ve grown yourself! 🍋🌿 The Gardening Elective made Key Lime Pie Ice Cream with garden-fresh limes, and it was every bit as delicious as it sounds! 🍦💚
Our 7th Grade Student Council members delivered treats and beverages to our local police department today as a small thank you for all they do. The officers were so kind — giving students a tour of the building, squad cars, and even letting them test out the handcuffs!
...@port_washington_pd_wisconsin Thank you for your time, your hospitality, and for keeping our community safe. We truly appreciate your support!
Paint By Numbers Elective: Students spent the last few weeks bringing their canvases to life one color at a time, and the finished pieces are absolutely stunning. Their patience, focus, and creativity really shined through in every painting.
Beautiful work, artists — we’re so proud of you!
Kindergarten to the rescue! Our students helped their turkeys go undercover before Thanksgiving… and the disguises are absolutely priceless. ♥️
Our Middle School students wrapped up their Food Truck Frenzy elective today, and we are blown away by their creativity and hard work! Over the past few weeks, students designed their own food truck businesses from the ground up — creating a business plan, building a menu, setting prices, ...crafting a marketing strategy, and even 3D-printing their very own food truck models complete with serving windows!
Today was the big day: presentations AND taste-testing! Students proudly shared their concepts and brought in food samples inspired by their menus for classmates to enjoy. The room was full of teamwork, innovation, and some seriously delicious ideas.
Amazing job to all our young entrepreneurs!
Individual Ticket Prices go up SOON. To secure your seat for the lowest price...now is the time.
Enjoy:
*Live Casino-Style Games (Roulette, Craps & Blackjack with Classic Casino Entertainment) & Raffles
*DJ (Sound By Design MKE) & Dance Floor
*Fantastic Dining with... From Scratch Catering & Signature Cocktails
*Exciting Silent & Live Auctions
Whether you’re reserving your seat or going ALL IN as a sponsor, your support makes a lasting impact on our students and their future. Reserve your spot & explore sponsorships: https://keyevent2026.cbo.io/
Let’s go ALL IN—celebrating our mission, our students, and the future of SJ23!