Private Schools in Union, Illinois

St. Mary Catholic School is one of the oldest and most respected private schools in McHenry County, serving students from Union and surrounding communities. The school offers a comprehensive Pre-K through 8th grade education with strong emphasis on Catholic values, academic excellence, and character development. The curriculum includes advanced mathematics, literacy programs, science labs, and technology integration with 1:1 iPad program. Extracurricular activities include sports, choir, band, and various clubs. The school maintains small class sizes and has a reputation for preparing students well for high school.

Marian Central Catholic High School is a highly-regarded co-educational Catholic high school serving students throughout McHenry County, including Union. The school offers a rigorous college preparatory curriculum with 16 Advanced Placement courses, comprehensive STEM programs, and competitive athletics. With a student-teacher ratio of 15:1, the school provides personalized attention and strong community values. Facilities include modern science labs, performing arts spaces, and extensive athletic facilities. The school has a 99% college acceptance rate and emphasizes character development alongside academic excellence.

St. Thomas the Apostle School serves families throughout McHenry County, including Union, with a comprehensive Pre-K through 8th grade education. The school features a strong academic program with emphasis on STEM education, Spanish language instruction from preschool onward, and integrated technology throughout the curriculum. The campus includes modern classrooms, science labs, a dedicated STEM lab, and extensive playground facilities. The school maintains small class sizes with a student-teacher ratio of 18:1 and offers robust extracurricular programs including athletics, music, and community service opportunities.