I received a call from this number today. The caller identified herself as an employee of the Snohomish County Courthouse. They were trying to get a hold of me because I'm enrolled in their victim notification program and they wanted to let me know the guy who burglarized my apartment is about to get out.
She was very legit and knew lots of details about the case. said they tried to mail me a letter but it got returned (I moved out of that apartment years ago). After doing a google search on this number and finding this website, I tried calling back and got a busy signal.
I'm leaning towards the "central number for all government agencies" theory.
We get a FAX call from 425-513-0800 that displays SOW-DIS-TSD. It is AX call and we do not accept unsolicited FAX calls. Call back says that the number is Diconnected or No Longer In Use. We get about omnephone call in the AM every three or four days.