The Account Map View presents the accounts as pins on a map allowing you to see a visual display of their location.
Accounts can be categorized by any of Property1-5 that have been uploaded for the Account. A property is then selected to color code the pins by on the map.
The pins can be color coded only if you have uploaded at least one Property field for Accounts.
For more information on Account properties see: Importing Accounts
Go to Settings -> Setup
Go to Accounts -> Map View
Select a property to define the pin color by.
Select a color for each value of the Property that is listed (including Blank, you may have blank values for some Accounts).
The pin on the map will be colored by the value in the Account Property.
If for some reason you are not seeing your pins on the Account Map View follow these instructions: Pins not showing on Map View