Inside the main contacts page screen in your CRM account, you have a drop-down menu to display your contacts in different views.  One of these views is called Map View as shown below:

Map View enables you to view your contacts by location. Use the zoom plus and minus buttons as shown in the bottom right hand corner to change your view:

Zoom further in to see the exact location of your contact(s) and click on the red pin icon to select their contact record: