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 October 2021 service change. RapidRide King County Metro's RapidRide lines are designated by letters. RapidRide routes also have a numerical designation in the range 671-676, but this is not displayed to passengers. 1–99 (Seattle) These routes run mostly within the city of Seattle. Trolley routes may be operated by electric trolleybuses. Conventional routes are not operated by trolleybuses, but are instead operated by diesel, diesel-electric hybrid, or battery-electric buses. All bus routes in other sections of this page are conventional routes. Route 90 (Snow Shuttle) 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 from approximately 5:30 a.m. to 11:30 p.m. Route 96 & 98 (Seattle Streetcar) Route 97 (Link Shuttle) 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. 100s (South King County) Routes in the 100 series primarily serve destinations in South King County and on Vashon Island. 200s (East King County) Routes in the 200s primarily serve East King County. 300s (North King County) Routes in the 300s serve North King County which includes Shoreline, Lake Forest Park, Kenmore, Bothell, Woodinville and Duvall. 400s (Community Transit Commuter - Seattle) Routes in this series are reserved for Community Transit's commuter routes connecting Downtown