If you’re thinking about getting into or out of downtown Seattle Thursday afternoon, you may want to consider leaving early.

Sound Transit and King County Metro warn that service in downtown will likely be delayed Thursday during the afternoon and evening commute because of the annual May Day immigration march. Transit users may want to take earlier buses, and allow extra time to travel through the downtown area, according to Sound Transit.

An estimated 600 people are expected to gather at Judkins Park in the Central Area for a 1 p.m. immigration rally. After the rally, attendees will head to St. Mary’s Church, 611 20th Ave. S., for a “May Day March and Rally for Workers and Immigrant Rights” at 3 p.m. The march will end at Westlake Park.

There is also the Capitol Hill May Day concert from 5 to 7 p.m. at Seattle Central College, 1701 Broadway.

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According to various websites, anarchists are also being encouraged to meet at Seattle Central College at 6 p.m. for a march into downtown Seattle.

A second anarchist march, dubbed “May Day Anticapitalist March,” is scheduled for 6:30 p.m. at the King County Juvenile Detention center at 12th Avenue and East Spruce Street.

Metro officials say that Fourth Avenue is expected to be closed between 3:30 and 4:30 p.m. and Pine Street is expected to be closed between 3 and 7 p.m.

During the respective street closures, Fourth Avenue bus routes will travel instead on Third Avenue, and Pine Street buses will travel on Union Street.

For information on route changes, check Metro’s website at www.metro.kingcounty.gov and Sound Transit’s website at www.soundtransit.org.

Information from Seattle Times archives is included in this report.

Jennifer Sullivan: 206-464-8294 or jensullivan@seattletimes.com. On Twitter @SeattleSullivan.