The diocese is led by a bishop and staff and provides episcopal supervision and some administrative assistance for its parishes.

The diocesan offices were located for many years at the campus of the Cathedral Church of Saint John, in Wilmington, Delaware.

When the cathedral closed in 2012, the offices moved, in 2014, to 913 Wilson Road, Wilmington, DE the site of the former Saint Alban's Church.

It is one of the nine original Dioceses of the Episcopal Church in the United States of America.

This list includes all the active congregations in the Episcopal Diocese of Delaware and the historical parishes will gradually be added.