About King County

Population 2.3 million residents
Area 2,307 square miles
County Seat Seattle
Municipalities 39 Cities & Towns
Named After Martin Luther King
Established 1852

King County, Washington, is the most populous county in the Pacific Northwest and the 12th most populous in the United States, with an estimated population exceeding 2.3 million residents as of 2024. Named after Martin Luther King Jr. (re-designated in 1986 from its original namesake, Vice President William R. King), King County spans approximately 2,307 square miles, including 2,116 square miles of land and 191 square miles of water. King County seat is Seattle, the state's largest city and a major economic and cultural hub. King County includes 39 incorporated cities and towns, including Bellevue, Renton, Kent, Federal Way, Auburn, Redmond, and Sammamish. Geographic features include Puget Sound to the west, the Cascade Range to the east, and numerous lakes including Lake Washington and Lake Sammamish. Major landmarks include Mount Rainier (visible from much of King County), the Space Needle, Pike Place Market, and the University of Washington. Established on December 22, 1852, King County was one of the first twelve counties created by the Oregon Territory legislature. King County government operates through an elected County Executive and a nine-member County Council. Key county agencies include King County Recorder's Office (located in King County Administration Building at 500 4th Avenue, Seattle, WA 98104), King County Assessor (same address), and King County Elections office (919 SW Grady Way, Renton, WA 98057). What makes King County unique is its combination of dense urban development, thriving technology sector (home to Microsoft, Amazon, and Boeing facilities), progressive policies, significant natural beauty, and diverse population representing over 100 languages spoken.

500 4th Avenue, Seattle, WA 98104

Court Records & Case Information

The King County Superior Court serves King County and is located at 516 3rd Ave. The court handles civil, criminal, family, and probate cases for the region. Court records and case filings can be requested in person or through the Washington online court portal.

King County Superior Court is the court of general jurisdiction in King County, Washington. It is located in Seattle, WA. The court has jurisdiction over civil, criminal, family, juvenile, probate, and mental health cases.

Sheriff, Police & Law Enforcement

Law Enforcement & Arrests

  • Mugshots and booking photos are generally available through the online inmate roster or by public records request.
  • Processing fees may apply for extensive records requests.
  • Port of Seattle Police provides specialized law enforcement at Seattle-Tacoma International Airport and seaport facilities.
500 4th Avenue, Seattle, WA 98104 • Phone: 206-296-3311

Criminal, Arrest & Jail Records

Criminal Records

  • Residents can request background checks for employment or personal purposes, accessing information on convictions, arrests, and pending charges.

Jail & Inmate Records

  • The bond and bail process in Washington allows for the release of individuals pending trial, with bail amounts set by the court based on the severity of the offense and the individual's criminal history.

Courts & Case Records

  • Court records can be searched online through the Washington Courts website at dw.courts.wa.gov or through the Superior Court's case search portal.
  • Most online searches are free for basic information, though certified copies require fees ranging from $5-$20 per document.
  • Remote access to court documents is available through the statewide JIS-Link system for subscribers ($30/month plus per-transaction fees).
  • Walk-in requesters can access records at clerk's offices during business hours.

Property & Public Records

  • The online property search is free for viewing, though certified copies cost $5 for the first page and $1 for each additional page.
  • Property tax information is maintained by King County Assessor's Office (same address, phone: 206-296-7300) and King County Treasury Operations (phone: 206-263-2890).
  • King County's iMap geographic information system (kingcounty.gov/imap) provides free access to parcel maps, zoning information, environmental data, and property boundaries.
  • Recording fees are established by state statute (RCW 36.18.010) and typically range from $50-$200 depending on document type and page count.
500 4th Avenue, Room 130, Seattle, WA 98104 • Phone: 206-296-0100

Vital Records

Vital records for this county include birth, death, marriage, and divorce certificates issued under state vital statistics law.

  • Processing time is typically 2-4 weeks for mail requests and same-day or next-day for in-person requests if records are readily available.
  • Death certificates are also available through Public Health, Seattle & King County for deaths occurring in King County, with the same fee structure and identification requirements.
  • Authorized requesters include family members, legal representatives, and anyone with a direct and tangible interest.
  • Couples must apply in person together, pay a $64 fee, and wait three days before the license becomes valid (waiver available for additional fee).
  • Marriage certificates cost $10 for certified copies.
500 4th Avenue, Room 130, Seattle, WA 98104 • Phone: 206-296-4769

Business & Licensing

Business records, licenses, and permits for this county are processed by the County Clerk and local government offices.

  • DBA filings cost $50 and must be renewed every five years.
  • Building permits, land use permits, and environmental review for unincorporated areas are processed through this division.
  • The Seattle Metropolitan Chamber of Commerce (seattlechamber.com, phone: 206-389-7200) and the Bellevue Chamber of Commerce (bellevuechamber.org) serve as major business advocacy organizations.

Official Government Resources

Frequently Asked Questions

How can I search for someone recently arrested in King County, Washington?
To search for someone recently arrested in King County, you can use the King County Correctional Facility's online inmate lookup tool. This facility, located in Seattle, provides a searchable database where you can find information about current inmates. You will need the individual's name or booking number to perform a search. The online tool is accessible through the county Department of Adult and Juvenile Detention's website.
Mugshots or booking photos For people arrested in King County can be obtained through the King County Sheriff's Office. The Sheriff's Office may provide access to these records via their public records request process. Some information might be available through the King Department of Adult and Juvenile Detention's online portal, depending on the case and privacy regulations.
In King County, you can obtain a criminal background check through the Washington State Patrol's Criminal History Records Section. The process involves submitting a request through the Washington Access to Criminal History (WATCH) online system. This service provides access to conviction records and arrest information for the state of Washington, including King County.
To look up sex offenders in King County, you can use the Washington State Sex Offender Information Center. This registry provides detailed information about registered sex offenders living in King County and throughout Washington. The database is accessible online and allows searches by name, address, or proximity to a specific location.
Voter registration in King County is handled by King County Elections (919 SW Grady Way, Renton, WA 98057, phone: 206-296-8683). You can register online at vote.wa.gov if you have a Washington State driver's license or ID, or register in person, by mail, or when obtaining a driver's license. The deadline is 8 days before any election. Washington is a vote-by-mail state, so all registered voters automatically receive ballots by mail, which can be returned postage-free or deposited at over 70 ballot drop boxes throughout the region.
Property records in King County are maintained by the King County Auditor's Office (500 4th Avenue, Room 130, Seattle, 206-296-0100, kingcounty.gov/depts/records-elections/recorders-office) and the Assessor (206) 296-7300, kingcounty.gov/assessor). You can search deeds, mortgages, liens, and other recorded documents free online through the Recorder's Document Search system. Property tax information, assessed values, and parcel details are available through the Assessor's e-Real Property application and the county's iMap GIS system. Certified copies cost $5 for the first page plus $1 per additional page and can be ordered online, by mail, or in person.
Birth and death certificates for events occurring in King County can be requested from Public Health, Seattle & King County (401 5th Avenue, Suite 1100, Seattle, 206-296-4769) or the Washington State Department of Health (360) 236-4300). Certificates cost $25 for the first copy and $20 for additional copies ordered simultaneously. You must provide valid photo ID and demonstrate a direct and tangible interest in the record. Processing takes 2-4 weeks by mail or same-day/next-day for in-person requests; online ordering is available through VitalChek.com with additional fees for expedited service.
Business entity registrations (corporations, LLCs, partnerships) are searchable free online through the Washington Secretary of State at corporations.sos.wa.gov. Fictitious name (DBA) registrations for King County are filed with the King County Auditor's Office (206) 296-0100). Individual cities within King County issue their own business licenses; for example, Seattle business licenses are handled by the City of Seattle Finance and Administrative Services (206) 684-8484, seattle.gov/business-licenses). Professional licenses are issued by the Washington State Department of Licensing at dol.wa.gov, and tax registrations are managed by the Department of Revenue at dor.wa.gov.

Nearby Counties

Pierce County WA Snohomish County WA Kitsap County WA Yakima County WA Chelan County WA