At the amalgamation in 1998 which formed Columba Catholic College, each previous school became a campus for the new school.
These schools were Mount Carmel College, St Mary's College, and St. Columba's Primary School. Since the beginning of 2005, further restructure has taken place, and the College operates on two campuses, Mount Carmel for years 7 to 12, and St Mary's Pre-school to year 6.
Mount Carmel Campus: Years 7-12 & Boys' Residential
Saint Mary's Campus: Prep - Year 6 & Girls' Residential
