The diocese was formed on 1 January 1979, after the Malankara Syrian Christian managing committee recommended splitting the existing Kollam diocese the year before. Thiruvananthapuram has stood as an independent diocese ever since.
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.
6 districts, listed alphabetically.