I have been receiving calls from this number over the past few weeks. I called back and the recording stated "Thank you for calling our Fund Raising center."
They are fund raisers for the WA Fraternal Order of Police, WA Fire Department, and some sort of other State Police or something.
These people are the most harrassing people on the planet. After many, many requests to stop calling they persist, multiple times per day.
Do NOT talk to them, ever. If they do talk to you, hang up. DO NOT give any money to these crooks! I'm not even sure at this point they actually give any money to these agencies.