Mercer Island Marriage License
Mercer Island residents who need a marriage license apply at King County Records and Licensing Services in Seattle. The City of Mercer Island does not issue marriage licenses. Mercer Island is part of King County, and the county handles all marriage licensing for people who live here. Both applicants must appear in person at the county office to complete the process. This page covers where to go, what documents to bring, how much the fee is, how the waiting period works, and where to search existing Mercer Island and King County marriage license records.
Mercer Island Overview
Getting a Marriage License in Mercer Island
Mercer Island is in King County. That means you go to King County Records and Licensing Services in Seattle to get your marriage license. The county office mailing address is 500 4th Ave, Room 311, Seattle, WA 98104. Mercer Island connects to Seattle via I-90, making the drive across the lake relatively short under normal traffic conditions, typically 15 to 25 minutes. The office phone number is (206) 477-6620.
Washington law under RCW Chapter 26.04 gives county offices authority over marriage licensing. The City of Mercer Island at 9611 SE 36th St manages city services. You can call the city at (206) 275-7600, but city staff cannot process a marriage license application. They will direct you to King County. King County handles everything from the initial application through the final recorded certificate.
King County's online pre-application tool lets you enter your information before visiting the office. This is optional, but it can cut down the time you spend at the counter. Even with a pre-application complete, both people must still appear in person on the same day to receive the license. Visit kingcounty.gov/en/dept/records-licensing to access the pre-application and check current office hours before you go.
| Office | King County Records and Licensing Services |
|---|---|
| Address | 500 4th Ave, Room 311 Seattle, WA 98104 |
| Phone | (206) 477-6620 |
| Website | kingcounty.gov/en/dept/records-licensing |
The King County office is open weekdays during regular business hours. Office hours can change around holidays, so it is worth calling or checking the website before you make the trip from Mercer Island. Both applicants must arrive at the same time. You cannot split the visit.
Mercer Island Marriage License Requirements
King County follows Washington State law for marriage license eligibility and documentation. Both applicants must be at least 18 years old. If one person is 17, court approval is required before the license can be issued, which goes beyond the standard process. There is no residency requirement in Washington. You do not have to live in Mercer Island, King County, or even Washington State to get a license here, as long as your ceremony will be held in Washington.
Each applicant must show a valid, government-issued photo ID. A current driver's license, state ID card, passport, or military ID all meet this requirement. Expired IDs are not accepted. The name on your ID should match the name you intend to use on the marriage license. If your legal name has changed and your ID has not been updated, bring supporting documents that show the legal name chain, such as a prior marriage certificate, divorce decree, or court order.
You will provide your Social Security number on the application form. You do not need the physical card. If either applicant was previously married, know how and when that marriage ended. The clerk will ask for the end date of any prior marriage. A divorce date, annulment date, or the date a spouse passed away are what the office needs. Have this ready before you arrive to keep the process moving. Providing false information on a marriage license application is a criminal offense under Washington law.
Washington does not require a blood test or a medical certificate. Under RCW 26.04.160, the clerk captures the required information and issues the license once everything is in order. No waiting at a separate appointment is needed beyond the in-person visit itself.
Fees and Waiting Period
The King County marriage license fee is $169 as of July 2025. This is among the higher fees in Washington State. King County added surcharges connected to House Bill 1498, which established the Domestic Violence Co-Responder Grant Program. The fee is paid at the time of application. It is non-refundable. Call the office at (206) 477-6620 to confirm current accepted payment methods before your visit.
Washington law requires a three-day waiting period after a license is issued before the ceremony can take place. This rule is set by RCW 26.04.180. The waiting period applies across all Washington counties and cannot be shortened or waived. If you apply on a Tuesday, the earliest your ceremony can occur is Friday. The license remains valid for 60 days after it is issued. If the ceremony does not happen within that window, the license expires and you must reapply and pay again.
After the ceremony takes place, the officiant signs the license and must return it to the King County office within the time required by state law. The county records the marriage and creates the official certificate on file. Certified copies of that certificate are separate documents, each available at a cost of $3 from the King County office when ordered later.
Note: Verify the current King County marriage license fee before your visit, as amounts can change with state legislation or county decisions.
Mercer Island Marriage License Records
Marriage license records for Mercer Island residents are maintained by King County Records and Licensing Services after the license is returned and recorded. The recorded marriage certificate is a public record in Washington State. Copies can be requested in person at the Seattle office or by mail. Certified copies cost $3 each and are needed for legal purposes like name changes or passport applications. Uncertified copies are cheaper but may not be accepted by government agencies.
The Washington State Department of Health maintains statewide vital records, including certified marriage records going back to 1968. You can order through doh.wa.gov. If you want to order online, VitalChek processes official certified copy requests from state and county offices. That is a convenient path if visiting an office in person is not practical.
For historical King County marriage records, the Washington State Digital Archives at digitalarchives.wa.gov holds scanned documents going back to 1853. Searches are free. The archive is maintained by the Washington State Archives and covers counties across the state. It is particularly useful for genealogy research or finding older records that may not be part of the county's current digital system.
The Washington State Digital Archives holds historical marriage license records from King County and counties across the state. Searches are free and useful for locating older Mercer Island marriage records.
King County Marriage License Resources
Mercer Island is in King County. The county office processes all marriage license applications, records completed documents, and maintains the official record set for the area. For a full look at King County marriage license procedures, fees, and office details, visit the county page on this site.
Nearby Cities
These cities are near Mercer Island. Most are also in King County and use the same county office for marriage license applications.