Lumping spatial data on Bing Maps

Hello,

Please refer to the screenshot below.

I have mapped this data based on postal codes.

I am looking for suggestions of 'How I can best visualize this data on the Map view by lumping all these points based on specific regions'

I could

1) Create a region lookup up table and relate it to this data table. Give the region some pseudo longitide and latitude

and map it

2)Look up coordinates for each postal code. Create some complicated DAX expression which calculates distances between the coordinates and lumps the data itself

3) Use a Heat Map

Any other suggestions other than the above would be appreciated.