From their website:
Search ThomasNet to find manufacturers, distributors and service providers - from Actuators to Zirconium and everything in between.
If you're looking for a product, you can type it right into the search box or use the categories. Use the links above the search box to find brands or companies. The scope covers the US and Canada, but you can't search by region. It's either all locations or one state/province. Some states are subdivided, like Massachusetts (into Eastern and Western halves), so depending on where you live you might have to do a couple searches to find everything.
Click on the company name to see contact information. You can also compare companies, or email or print results. Once on a company's page you can write notes and save them, provided you've created an account for yourself.