Question: It is said [here](http://www.psychologytoday.com/articles/200607/the-mysteries-perfect-pitch) that 1 in 10,000 people have absolute pitch. I wonder if there is any serious poll that could confirm this.

Do you know any study that could tell how common/uncommon it is to have absolute pitch ?

Answer: 
Those numbers are a rough estimate, and only applies to US citizens. 

Wikipedia has a thorough overview of the relevant information, [here](http://en.wikipedia.org/wiki/Absolute_pitch). The most salient points:

* Absolute pitch seems to be a cognitive act. It's a property of our brains, and not our ears
* Most people exhibit some ability or sub-components of absolute pitch
* Absolute pitch appears to be trainable to a very high degree. It can be taught/learned.
* Different populations have different percent exhibition for absolute pitch - some estimates for chinese speaking populations go as high as 40-50%.

So, two answers to your question:

* 1/10000 is a rough estimate for US citizens exhibiting absolute pitch
* Since absolute pitch is trainable, and most people exhibit some components of it, it's unlikely we can get better than a very rough estimate.
This is less a music question than a behavioral science question, and there is a self-diagnosed issue with much such research is focused on a sample set that is *"WEIRD"*: Western, educated, industrialized, rich and democratic.

There is no reason to believe that the proportion of people with perfect pitch in a university with researchers studying the brain, which often has a school of music which might attract people with perfect pitch wanting to participate in scientific studies for pizza money, has any relation to the proportion of the same generally.