Gov. Arnold Schwarzenegger will participate in a ceremony following the parade to honor the team, in which Mayor Gavin Newsom will present the Giants with a key to the city.
Huge crowds are lining the parade route beginning at Montgomery and Washington streets and proceeding up Montgomery Street to Market Street then up Market to McAllister Street, and finally to Civic Center Plaza. The route is nostalgic of that first traveled by the Giants when the team first came from New York in 1958.
Officials are advising people to take public transit.
Golden Gate Ferry is planning to use extra ferries, and the Bay Area Rapid Transit system will run longer trains.
San Francisco Department of Public Works employees will be on hand to clean up after thousands of Giants fans gather for the victory parade this morning, city officials said.
Department of Public Works Director of Communications Christine Falvey said the office has established a small, but efficient army of staff to tidy up the route both during and after the parade.
"All of our staff are Giants fans, so we are really excited to do our part and get the city clean and green," Falvey said.
The department has placed extra trash and recycling receptacles around the celebration site, Falvey said.
Watch the parade online at ABC7NEWS.COM.
ABC7, the Associated Press and Bay City News have contributed to this report