I have received multiple calls from this number, but have never called them back. They leave a voicemail, but never in the voicemail do they mention what the call is regarding. They just say that they are from Monterey County and want me to call them back. I definitely feel that this is a scam, although the people who leave the voicemail don't sound like they are from a foreign country or anything, but honestly, if it wasn't a scam and they really needed to get a hold of me, I'm pretty sure they would leave a more detailed voicemail.

Hi, this is a Monterey County number/line.  The call varies from different departments.   From Child Support, Health Department, Social Services to Emergency Services.   I understand it's very frustrating receiving a call from this number and no messages are left.  I always leave the name of the person whom I'm trying to reach, my name, my department and my phone number.