The threat was reported to law enforcement around 8:45 a.m.
A spokesperson for the school says the campus was evacuated and searched by law enforcement, but the threat was unsubstantiated.
The Ronald C. Wornick Jewish Day School is a partner of the Osher Marin Jewish Community Center.
Occupants of the Jewish Community Center located at 200 N. San Pedro Road were taken to The Marin School at 150 N. San Pedro Road, according to Marin County Sheriff Doug Pittman.
Surrounding schools were placed on lockdown as a precaution, Pittman said.
There are reports that several Jewish Community Centers across the country also received similar threats.