The EMAS register is an online database hosted by the European Commission which lists all EMAS registered organisations and sites.
Anybody can search the register and download the search results to Excel.
You can also find statistics here. These are updated twice a year.
Disclaimer: The accurary of the data provided is dependent on the information submitted by the individual Member States.
Please note that you are now leaving the official EMAS website, as the EMAS Register is part of another domain.