Update 12/20/09: I have a new list of current categories at Google Local Business Center Categories – The Complete List
Update 10/13/2009: If you have found this old post then you are a motivated searcher. I am now developing a searchable database of Google’s current categories. If you think that easy access to Google’s category information would be helpful to you, contact me at firstname.lastname@example.org and let me know that you are interested in testing the beta.
The categories that Google uses in Maps have always been confusing. They have their own very limited list and then they integrate categories from their other providers in a non-transparent way that causes confusion.
In a first step to making this more tranparent, Reuben Yau has created the first full summary of Google’s own Local Business Center categories.
Previously Reuben wrote: The other thing I noticed is that the category for that site is Gazebo Builder which is taken from Acxiomâ€™s database, but that category is not present within GLBC. FYI Acxiom is the database behind yellowpages etc.
It would be of interest to gain a complete list of these categories and attempt to map them to Google’s.