St. John's has three campuses:

Primary Division (Form I - II or Pre-K and K) on Rome Avenue.

Lower Division ( Form III - VI, or K - grade 4) on Orleans Avenue.

Middle Division (Form VII - X, or grades 5-8) on Plant Avenue.

The Lower School is adjacent to St. John's Episcopal Church, where students attend chapel daily. The new Middle School campus includes Price Memorial Chapel, affording older students the same daily worship opportunities, and a new art studio, gymnasium and state of the art science lab. The Lower and Middle Schools also have open air athletic areas - a deck and a recreational field respectively. These campuses are fully updated, thanks to the major renovations and construction between 2000 and 2002.