Here is a quick and easy way to find the high-level information on where your data is stored. As we know, Microsoft has multiple data centers around the globe. Microsoft will use the country specified, when opening the tenant, as a location for the data. In saying that there are some of the Office 365 services that are not offered in all Microsoft data centers, so you will have to piece together your data location. Exchange, SharePoint and Skype can we seen from the Office 365 Admin center.
Open the Office 365 Admin Center
Expand Organization Profile
Scroll down to data location
To view the specifics about what Microsoft services are available in your specified region, please use this site.