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40 Worcester Business Journal | Book of Lists 2025 | wbjournal.com F O C U S E D U C A T I O N & N O N P R O F I T S Largest private high schools Ranked by total enrollment, 2024-2025 School Total enrollment Grades/ student body Day tuition/ boarding tuition Tuition notes Head of school/ year founded 1 St. John's High School 378 Main St., Shrewsbury 01545 508-842-8934 • stjohnshigh.org 905 7-12 Boys $20,255 N/A Day school only Benjamin P. Horgan 1898 2 Whitinsville Christian School 279 Linwood Ave., Whitinsville 01588 508-234-8211 • whitinsvillechristian.org 616 Pre-K-12 Co-ed $18,000 N/A Day school only Sarah Bowler 1928 3 Worcester Academy 81 Providence St., Worcester 01604 508-754-5302 • worcesteracademy.org 508 6-12, postgraduate Co-ed $46,000 $62,725 For 2025-26 academic year; upper school Kevin Breen 1834 4 Bancroft School 110 Shore Drive, Worcester 01605 508-854-9227 • bancroftschool.org 441 Pre-K-12 Co-ed $39,250 N/A Day school only Stephanie Luebbers 1900 5 Lawrence Academy 26 Powderhouse Road, Groton 01450 978-448-6535 • lacademy.edu 400 9-12 Co-ed $63,250 $78,150 Dan Scheibe 1792 6 Cushing Academy 39 School St., Ashburnham 01430 978-827-7000 • cushing.org 385 9-12, postgraduate Co-ed $52,600 $77,800 For 2025-26 academic year Randy R. Bertin 1865 7 St. Mark's School 25 Marlboro Road, Southborough 01772 508-786-6000 • stmarksschool.org 377 9-12 Co-ed $62,920 $79,140 For 2025-26 academic year Ivory D. Hills 1865 8 St. Paul Diocesan Jr/Sr High School 144 Granite St., Worcester 01604 508-852-5555 • saintpaulknights.org 375 7-12 Co-ed $11,000 N/A Day school only José Carvajal 2020 9 The Winchendon School 172 Ash St., Winchendon 01475 978-297-1223 • winchendon.org 285 9-12, postgraduate Co-ed $36,250 $77,500 For 2025-26 academic year Sean Duncan 1926 10 South Lancaster Academy 198 George Hill Road, Lancaster 01523 978-368-8544 • mysla.org 283 Pre-K-12 Co-ed $14,440 N/A High school; day school only Ollyce Gardner 1882 11 Notre Dame Academy 425 Salisbury St., Worcester 01609 508-757-6200 • nda-worc.org 258 7-12 Girls $18,062 N/A High school; day school only Marilyn Tenzca 1951 12 St. Bernard's High School 45 Harvard St., Fitchburg 01420 978-342-3212 • stbernardshighschool.org 234 9-12 Co-ed $10,660 $0 For 2025-26 academic year; day school only Joseph Cussen 1920 13 Immaculate Heart of Mary 282 Still River Road, Harvard 01451 978-456-8877 • immaculateheartschool.org 134 1-12 Co-ed $4,000 N/A Day school only Bro. Thomas Augustine 1976 Source: Each school via survey as of Q1-Q2 2025, school websites and Boarding School Review. Note: N/A=not applicable. -Compiled by: Stephanie R. Meagher, research@nebusinessmedia.com