Looking for top book marketing companies in the USA? These are companies that specialize in promoting and selling books to readers. Whether you're an author looking to promote your latest work or a publisher seeking to increase sales, these companies can help you get your book in front of the right audience. They offer a range of services including book promotion, advertising, social media marketing, and more. Some of the top book marketing companies in the USA include Smith Publicity, BookBaby, and Author Solutions.