Protesters dressed in white started out at the Anaheim Police Department headquarters, where police officers were present around the building as well as on the roof.
The crowd marched down Harbor Boulevard toward Disneyland around 2 p.m. and were met by police in riot gear who prevented them from reaching the resort entrance.
Police on horseback flanked the crowd as they marched down the road. Some demonstrators could be heard chanting, "Whose streets? Our streets."
Police said there were between 200 and 300 protesters at the height of the gathering. They said they planned to allow protesters to demonstrate so long as they followed rules and stayed out of the street.
A total of nine people were arrested, officials said. There were no reports of major damage.
Later Sunday evening, a memorial service was held at La Palma Avenue and Anna Drive for one of the men killed by Anaheim police, Manuel Diaz. The 25 year old was shot dead as he fled on foot and police approached him. Diaz was unarmed.
The family of Diaz have called for peaceful demonstrations.