Who called from 2062006126

Just received a call from this number and ignored it.  Been getting a couple of calls each week since the New Year from various Washington state area codes.  How do you unsubcribe to stop the nuisance?

I got a call from them a few min ago. Did not leave a message.

Same thing...ignored the call  ... received 12:02 Eastern

Got a call from this number..no message. 12:33 Eastern time.  I now live on the East Coast, but my cell # is a Midwest number. I don't know anyone in Seattle!

Just received a call from 206-200-6126 at 10:44 MST on 01/26/2012. Left no message. Don't know anyone at this area code.