Sheriff's spokeswoman Shari Ireton said Tuesday that neither 31-year-old Jason Dolman nor Riza Ysulat, 36, have been at their jobs since that date and their cell phones have been turned off.
The couple were dating. The spokeswoman says they left medications and other personal items in their homes.
Friends and family members say the disappearance is completely out of character for the couple and they have no idea what might have happened.
Terri Dolman said her son, Jason, was heading to work the last time she saw him. When she didn't hear from him for a day or two, she began to worry.
"He was here all the time," she said. "No call, no anything. I knew something was wrong then because that's just not like him."
Dolman's criminal history includes assault, burglary and possession of drugs, but his family said he's been staying out of trouble.
"He didn't drink or do anything else. He's been clean for a long time," said Terri Dolman.
Terri said everything seemed normal leading up to the couple's disappearance, but she did mention that Jason recently deleted information from his Facebook page, including his family tree.
The couple was reportedly driving a red 1999 Mitsubishi Mirage. Anyone with information about the disappearance is asked to call the Snohomish County sheriff's office.