How Can I Find All Companies Of A Specific Category Residing Within My State?

Just a disclaimer, I have zero experience dealing with data and stuff, so please bear with me.

Let’s say I want a list of all plumbing companies in my state. I want the name of their company, e-mail address, phone number, and general location. If this is too much, just their e-mail address is fine. Currently, I’ve been going to each and every business’s website and copying and pasting their contact information and general location. The problem is that doing it this way is that it takes forever. I wonder if there is a better approach or tool I can use to save time and achieve the same goal. Please let me know, thank you.