There are about 1400 makerspaces around the world. This up from only about 30-40 as recently as 2006.
This data is from Popular Science's BY THE NUMBERS: THE RISE OF THE MAKERSPACE. The article came out last February (we're behind in our reading).
Key quote describing makerspaces:
Also called hackerspaces or innovation labs, these establishments act as communal workshops where makers can share ideas and tools. They can pop up anywhere, including in schools, libraries, and community centers. Different locations offer different resources, ranging from 3D printers to synthetic biology kits.
If you've never been to a makerspace, you should go. They are a lot of fun.
The chart below is from the article (click to enlarge).
We've long tracked the maker movement and the rise of makerspaces. Our 2009 study on the maker movement is our 2nd favorite study (our food truck studies come in first). Tracking makerspaces is part of our ongoing coworking research project.