The parade will take place Thursday morning in downtown Oakland, following the same route as the team's parade to celebrate the 2015 NBA title.
It will start at 10 a.m. at Broadway and 11th Street, wind through downtown streets and end with a procession to the Henry J. Kaiser Convention Center.
The party began as soon as Kevin Durant, Stephen Curry and the Warriors beat the Cleveland Cavaliers 129-120 at Oracle Arena to clinch their second championship in three years.
In San Francisco, people hung out of cars waving blue and gold flags.
Across the bay, in downtown Oakland, about 1,000 people celebrated in the streets, but most were peaceful. Crowds gathered in intersections, including one where cheering fans made a circle to watch several men breakdance. Some climbed street lights, some sprayed champagne and some threw bottles leaving broken glass in streets. Others set off fireworks.