The Los Angeles County Sheriff's Department substation provides police protection to Marina del Rey residents and operates a boat patrol. The station formerly was the Marina del Rey Harbor Patrol, but the Sheriff's Department took over operations in 1984. The substation has a jail and a back dock is home to offshore and close-to-shore patrol boats. The station is also responsible for patrol in three unincorporated areas that stretch for about a mile inland.
The Deputy Sheriffs Association of Alameda County – whose administrative offices are located on Owens Dr. – represents Alameda County law enforcement in order to enhance wages, benefits and working conditions of the membership. It supports Alameda County communities through its charitable giving programs, and through the promotion of public safety initiatives.
The Sheriff's Office is located in the San Mateo County Offices in downtown Redwood City. The office provides professional law enforcement in conjunction with Redwood City's enforcement officials.