I am not endorsing any of the agents listed on this page. I am simply offering names of agencies for you to investigate. This is not, nor is it intended to be, a comprehensive listing of modeling agencies in the US.
Found a modeling agency nearby but don't know the next step that you should take? Find the answer to that question and more in my book, How to Become a Successful Commercial Model. You can read two sample chapters [ Chapter 1, Chapter 7 ] free and buy the book risk free for six months!