Welcome to the forum!
There is lots of information here to be found. Have a look. As for your question, there isn't a great way to find out if they have shops in your area before applying, but there are a few things you can do. First, try the larger ones (hint: the more discussion on the forum - the more shops they likely have. The top 15 most discussed list will help.) Second, try Jobslinger or Prestomobile.com. They both use the same data, which is the 70 or so Sassie companies to display shops by geographic area. Next, you could ask the companies directly. But know things change with time.
Good luck.
Happily shopping Rhode Island and nearby Massachusetts and Connecticut