Three men died at the scene, and a woman who was shot was taken to a hospital, where she was pronounced dead, according to King City Police Chief James Hunt.
Three other people injured by gunshots were taken to a hospital for treatment, and their conditions were not released.
MORE: 4 deputies injured, suspect dead after Santa Rosa shooting and pursuit: sheriff
4 deputies injured, suspect dead after Santa Rosa shooting and pursuit: sheriff
Police say that the shooting occurred when a vehicle pulled up to the residence in King City, located about 62 miles southeast of Monterey and about 100 miles south of San Jose, Calif.
Three masked men exited and began shooting at the people attending the party in the front yard, before getting back into the car and fleeing the scene, according to police.
Police are still looking for the three suspects who were wearing dark colored clothing and masks.
The-CNN-Wire & 2024 Cable News Network, Inc., a Warner Bros. Discovery Company. All rights reserved.
If you're on the ABC7 News app, click here to watch live