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Lexicanum says they are 'in scant supply'.

 Iron_Captain wrote:
Lexicanum says they are 'in scant supply'.

In 40K terms, this can be anywhere from a handful to several thousand, spread out across the Imperium. It's a million worlds, assuming Star Forts account for less than one percent of those planets, that's still a large amount. It's just that the galaxy is enormous.

This gives a lot of information about their origins, how they were constructed and their effectiveness. (With Pictures)
https://en.wikipedia.org/wiki/Star_fort

Seriously though, their rarity isn't really covered in 40k sources -
http://wh40k.lexicanum.com/wiki/Ramilles_Class_Star-fort
Etc.

In personal Head-cannon though, I'd say there's probably at least one for each major World and many more for ForgeWorlds and other Important Worlds.