Heather M. Hemmer, 28, was last seen Jan. 11.
Hemmer's family is concerned because it is unusual for her not to stay in contact with her children, Snohomish County sheriff's spokeswoman Shari Ireton said.
Hemmer is described as 5-foot-3 and 122 pounds with blonde hair, blue eyes and several tattoos. She may be in the Everett or Arlington areas.
Anyone with information should call police at 425-388-3845.
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