title: US Metro regions on google chart geo map
body: <p>I want to create a geo map with a specific state region, and individual metro area regions colored by intensity of the value. I have looked at the documentation but haven't been able to achieve this. Here is an example of what I am targeting for.</p>
  
  <p><img src="https://i.stack.imgur.com/Sn2EQ.png" alt="enter image description here"></p>
  
  <p>Does anyone has any idea what options to use for just showing e.g., CA state, and then marking the regions by zip code.</p>