Office of the State Actuary (OSA)—Monitors the balance between the cost of future retirement benefits and the projected value of retirement fund assets. Performs actuarial services for the Department of Retirement Systems. Provides actuarial assistance and advice to the Legislature. 

Joint Legislative Audit and Review Committee (JLARC)—Conducts performance audits, program evaluations, special studies, and sunset reviews for the Legislature and the citizens of Washington State.

Office of the Code Reviser/Statute Law Committee (SLC)—Codifies, indexes, and publishes the Revised Code of Washington. Provides a central bill drafting service.

Legislative Ethics Board (LEB)—Enforces state ethics laws and rules with respect to members and employees of the Legislature.

Legislative Evaluation and Accountability Program Committee (LEAP)—Serves as the Legislature's independent source of information and technology with respect to budgets and revenue.

Select Committee on Pension Policy (SCPP)—Reviews and recommends changes to Washington public retirement benefits.

Office of State Legislative Labor Relations​​ (OSLLR)—Assist the Legislature in implementing and managing collective bargaining for legislative employees. 

​ Legislative Support Services (LSS)—Provides legislative information services to the public, the legislative Gift Center, and media and facilities support to the Legislature.

LEG-TECH (Legislative Service Center)—Provides the IT infrastructure used by legislative agencies for law-making, research, communication, administrative and accounting responsibilities.

Joint Transportation Committee (JTC)—Serves as the joint House and Senate fact-finding committee on highways, streets, and bridges.