Yakima County Washington Government: Structure and Services

Yakima County is one of Washington's 39 counties and operates under the standard commission-administrator model established by state law. This page covers the county's governing structure, the range of services it delivers, the scenarios in which residents most commonly interact with county government, and the boundaries that separate county authority from state and municipal jurisdiction. Understanding how Yakima County functions helps residents navigate permitting, elections, public health, and land use decisions that affect daily life across the region.

Definition and scope

Yakima County government derives its authority from RCW Title 36, Washington's foundational statute governing county organization and powers. The county was established in 1865 and covers approximately 4,296 square miles in south-central Washington, making it one of the larger counties in the state by land area. As of the 2020 U.S. Census, Yakima County had a population of 256,037 (U.S. Census Bureau, 2020 Decennial Census).

The county seat is the City of Yakima, which functions as the administrative hub for most county departments. Yakima County's geographic scope encompasses unincorporated rural areas, 14 incorporated cities and towns, and portions of the Yakama Nation Reservation — a distinct sovereign jurisdiction whose governance is not covered by this page and does not fall under county authority.

Scope and coverage limitations: Yakima County government's authority applies to unincorporated areas and county-administered functions across the county. It does not govern the internal affairs of incorporated municipalities such as Yakima, Selah, or Sunnyside, which maintain their own city governments. Federal lands, tribal trust lands, and state-managed properties within the county's geographic boundaries are also outside county jurisdiction. For an overview of how county government fits into Washington's broader civic framework, the Washington County Government Structure page provides statewide context, and the site index lists all covered jurisdictions.

How it works

Yakima County operates under a three-member Board of County Commissioners (BOCC), the elected body that holds legislative and executive authority for the county. Commissioners serve four-year staggered terms and function collectively as the county's governing board — setting budgets, adopting ordinances, and overseeing county departments.

Day-to-day administration is handled by a County Administrator appointed by the BOCC, responsible for coordinating department operations and implementing board policy. This separates political decision-making from administrative management.

Key elected offices operating independently of the BOCC include:

County Assessor — Values all taxable property within the county for ad valorem tax purposes under RCW 84.40.
County Auditor — Administers elections, records real property documents, and manages licensing under RCW 36.22.
County Clerk — Maintains Superior Court records and case files.
County Prosecutor — Represents the county in civil matters and prosecutes criminal cases in the county's courts.
County Sheriff — Provides law enforcement for unincorporated areas and operates the county jail.
County Treasurer — Collects property taxes, manages county funds, and distributes revenues.

Yakima County Superior Court operates under the Washington Superior Courts system (RCW Title 2), handling felony criminal cases, family law matters, civil disputes above $75,000, and probate proceedings.

Primary county departments include Public Health, Planning, Public Works, Human Services, and Juvenile Court Services. The Yakima County Department of Public Health coordinates with the Washington Department of Health on disease surveillance, environmental health programs, and emergency preparedness.

Common scenarios

Residents interact with Yakima County government through a predictable set of transactions and services:

Property and land use. Unincorporated property owners file building permits, land use applications, and subdivision requests with the Yakima County Planning Division. The county enforces its Comprehensive Plan under the Washington State Growth Management Act (RCW 36.70A), which mandates planning coordination across jurisdictions.

Elections and voter registration. The Yakima County Auditor administers all local, state, and federal elections within the county. Washington is an all-mail ballot state under RCW 29A.40, meaning ballots are automatically mailed to registered voters. Voter registration, ballot drop boxes, and election results are administered through the Auditor's office.

Public health services. The county health department operates communicable disease programs, food safety inspections for establishments in unincorporated areas, and environmental health oversight including septic system permitting. These functions are distinct from services provided by the Washington Department of Health at the state level.

Property taxes. Property owners pay taxes assessed by the County Assessor and collected by the County Treasurer. Tax appeals are heard by the County Board of Equalization, a separate body established under RCW 84.48.

Criminal justice. Yakima County Sheriff's Office responds to calls for service in unincorporated areas. The County Jail, operated by the Sheriff, houses pretrial detainees and sentenced individuals serving terms under 12 months under RCW 70.48.

Decision boundaries

Yakima County government and adjacent authorities operate in overlapping geographic areas, making jurisdictional boundaries consequential. The comparison below clarifies where county authority ends and other jurisdictions begin.

County vs. City of Yakima. Building permits in the city limits of Yakima are issued by the city, not the county. Law enforcement within incorporated cities is handled by municipal police departments, not the County Sheriff (though the Sheriff may contract to provide services). The Yakima city government maintains its own planning, code enforcement, and utility systems independent of county administration.

County vs. State agencies. The Washington Department of Transportation manages state highways within Yakima County, while county roads are maintained by the County Public Works Department. Environmental permitting for industrial discharges falls to the Washington Department of Ecology, not the county. State-level fiscal oversight of county expenditures is conducted by the Washington State Auditor.

County vs. Tribal jurisdiction. The Yakama Nation exercises sovereign governmental authority over tribal trust lands. The county has no zoning, permitting, or enforcement authority within those boundaries. Agreements between the county and the Yakama Nation on specific services — such as road maintenance or public health coordination — are negotiated separately and are not a function of state statutes governing counties.

County vs. Special districts. Yakima County contains Washington Public Utility Districts, fire districts, irrigation districts, and school districts — each operating as independent governmental entities with their own elected boards and taxing authority. The BOCC does not govern these entities, though it may coordinate with them on land use and emergency management.

Counties adjacent to Yakima County — including Kittitas County to the north and Klickitat County to the south — operate under the same RCW Title 36 framework but maintain separate elected officials, budgets, and service delivery systems.

References

RCW Title 36 — Counties — Washington State Legislature
RCW 36.70A — Growth Management Act — Washington State Legislature
RCW 84.40 — Listing of Property for Taxation — Washington State Legislature
RCW 29A.40 — Mail Ballot Elections — Washington State Legislature
RCW 70.48 — County and City Jails — Washington State Legislature
U.S. Census Bureau — 2020 Decennial Census, Yakima County — U.S. Department of Commerce
Washington State Department of Health — RCW Title 43.70 — Washington State Legislature
Yakima County Official Website — Yakima County Government