List of King County Metro bus routes

This is a list of current routes operated by the mass transit agency King County Metro in the Greater Seattle area. It includes routes directly operated by the agency, routes operated by contractors and routes operated by King County Metro under contract with another agency. Routes are organized by route number (or letters in the case of RapidRide). Discontinued routes and former versions of existing routes are not listed.

These lists reflect the March 2017 service change.

King County Metro's RapidRide lines are designated by letters.

These routes run mostly within the city of Seattle.

Routes 82-84 operate seven days a week.

Routes 7, 36, 49, 120, 124 and the RapidRide A, C, D and E lines also provide Night Owl service.

Route 90 operates when snow routes are in effect in the Central Seattle area, and when the Emergency Service Network has been activated due to severe weather. Route 90 buses travel between Downtown Seattle and First Hill, via Capitol Hill, serving all marked stops along the route.

King County Metro operates Route 97 when service on Sound Transit's Central Link Light Rail is suspended for a prolonged period of time. If the entire line is closed, Route 97 buses emulate trains, stopping at every station along the line. If only a section of the line is closed, Route 97 buses serve as a "bus bridge" shuttling passengers between the operating sections of the line and stopping near intermediate stations on the closed section of the line, in the case of a multi-station closure. Limited stop variants of route 97 may also be operated in the case of a multi-station closure.

Route 99 replaces the suspended Waterfront Streetcar that operated with the same route number. 40-foot diesel buses operate between the International District and the Olympic Sculpture Park via Pioneer Square and 1st Ave. During the peak tourist months (June - September), buses run every 30 minutes, 7 days a week; during the other months service runs only during weekday peak hours.

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