Kollam's parishes trace their roots to the church's earliest foundations on the Kerala coast, in the tradition of the seven original churches associated with the apostle Thomas. It was formally organised as one of the church's dioceses in the 1877 reorganization.
Counts above reflect Orthodox-held institutions only; churches, chapels, and other properties currently under schismatic occupation are catalogued separately below and are not included in these totals.
7 districts, listed alphabetically.