Its territory includes parishes, monasteries, and missions located in eight states in the Western United States – Arizona, California, Colorado, Hawaii, Montana, Nevada, Oregon, and Washington.

Herman had served as the locum tenens of the diocese of San Francisco, Los Angeles and the West since the retirement of Bishop Tikhon (Fitzgerald) in November 2006.

During a special diocesan assembly held on January 31, 2007, Bishop Benjamin of Berkeley was unanimously nominated to replace Bishop Tikhon as Diocesan Hierarch.

The diocese is grouped geographically into six deaneries, each consisting of a number of parishes.

The deans coordinate activities in their area's parishes, and report to the diocesan bishop.