If you want to see geographically where your data is located in Office 365, login to the Office 365 portal as an administrator. Then select the Admin tile.
From the button on the left hand side mouse over the Settings (cog) to display the additional menu as shown above. From this menu select Organization profile.
Scroll down the page until you locate the Data location area as shown above. There you should see where the data for this tenant resides.
These links are also very helpful for answering Office 365 data location information: