The collision involved two passenger vehicles at the 15200 block of Ash Way, Snohomish County Sheriff's Office spokeswoman Shari Ireton said.
The accident was reported at around 3:10 p.m. Friday.
Six people were taken to hospitals, Snohomish County Fire District 1 reported.
One of the drivers was unconscious when firefighters arrived, District 1 spokeswoman Leslie Hynes said. He was transported by paramedics to Harborview Medical Center in Seattle. His passengers, a woman and a man in their 40s, were transported by firefighters to Providence Regional Medical Center Everett.
The driver of the other car was also seriously injured. She was taken by paramedics to Harborview. Her daughters, a toddler and a 13-year-old, had minor injuries and were also transported to Harborview Medical Center.
Ash Way was closed at 156th Avenue and transit buses were rerouted until further notice.
More Local News Headlines
Students impressed by career opportunities at Manufacturing Day 3-D technology finds some hidden cancers but can cost more Public Disclosure Commission calls Eyman's violations serious Arlington man dies in crash Hit and run in south Everett leaves woman in critical condition After audit, Lynnwood is fixing its financial problems Corey McCrea, 33: Snohomish skateboarder had found his gift Complaints say that commerce officials helped PUD score a grant
Our new comment system is not supported in IE 7. Please upgrade your browser here.