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Police said demonstrators tried to break into a vacant convention center, broke into City Hall and tried to occupy a local YMCA.
There were also reports of protestors throwing rocks, bottles and other objects at officers.
Police used tear gas and bean bags to disperse the mob.
Saturday's protests were the most turbulent since Oakland police forcefully dismantled an Occupy encampment in November.
The national Occupy Wall Street movement, which denounces corporate excess and economic inequality, began in New York City in the fall but has been largely dormant lately.
Oakland, New York and Los Angeles were among the cities with the largest and most vocal Occupy protests early on. The demonstrations ebbed after those cities used force to move out hundreds of demonstrators who had set up tent cities.
The Associated Press contributed to this report.
