Metro Transit route 4 is nearly identical to route 3, except for its terminal points on either end of the route. In fact, Metro's timetables list routes 4 and 3 together. Route 4 is a very popular route, always busy, and uses electric trolley buses most of the time.
At its northern end, route 4 terminates at east Queen Anne, on Nob Hill Avenue N, between Garfield and Galer Streets.
Route 4 follows Boston Street and Taylor Avenue N, on the east side of Queen Anne Hill. It stops at Seattle Center on 5th Avenue N.
It follows 3rd Avenue through Belltown and Downtown, stopping a few blocks from Pike Place Market and Seattle Public Library Central Library.
It turns up James Street onto First Hill, stops at Harborview Medical Center at 9th Avenue, and follows E Jefferson Street. It stops at Providence Medical Center.
Route 4 then turns south onto 23rd Avenue S, S Dearborn Street, S Judkins Street, Martin Luther King Jr Way S, and terminates on S Walker Street (between Martin Luther King Jr Way S and Rainier Avenue S), in Judkins Park.