Where can a 15-year-old work at in Mississippi?

You can't work legally until you're 16. If you work in a business, a true business, before that, it's prohibited by the child labor laws. Of course, you can start your own small business. You know, make crafts, sell lemonade or cookies, start a dog walking business, babysit, and other stuff for money. It all depends on what you like to do.