Essex Regional Retirement System (ERRS) is a contributory defined benefit plan public pension fund based in Danvers, Massachusetts. Established in 1937, the plan administers the public pension system for 47 local entities, including 19 towns, five school districts, 17 housing authorities, and six special districts throughout the Essex County of Massachusetts. The bulk of the fund is managed through the Pension Reserves Investment Management Board (PRIT) for the State of Massachusetts, but Essex also makes some investments independently. The assets of the plan are managed by the five-member board.