The INE (National Statistics Institute) provides the Provisory Results from the 2011 Census, determined in the intermediate stage of treatment and processing of the answers, collected on paper and online.
Approximately five months after the publishing of the Preliminary Results, on June 30th, users can now access relevant information prior to the publication of Final Results in the fourth quarter of 2012. 

The Provisional Results cover a wide set of information on Population and Housing, referring to March 21st, 2011 (time the census was conducted). Results 

For more information see the INE link concerning the 2011 Census