The United Inventors Association of America ( UIA )

The UIA  of America have collected a state by state list of different local inventors societies  and made the list into a downloadable PDF document that you can find here. Just click the image on their webpage and you should see the list in a moment.

USPTO’s list of resources by state

The United States Patent and Trademark Office (USPTO) is the federal agency for granting U.S. patents and registering trademarks, but they also maintain a very useful database which lists inventor organizations, patent attorneys and agents, patent and trademark resource center and much more. It is all listed by state, so if you live in the United States, this is the perfect place to find your local state-wide inventor organization!

USPTO’s list of resources by state