The Polaris Project has published 2017 statistics from the National Human Trafficking Hotline

The National Human Trafficking Hotline and BeFree Textline provide survivors of human trafficking with vital support and a variety of options to get help and stay safe. These could include connecting callers with local law enforcement, emergency shelters, transportation, trauma counselors or a range of other services and supports. The 40,000+ cases identified on these helplines comprise the largest publicly available data set on human trafficking in the United States. The data do not represent the full scope of human trafficking. Lack of awareness of the crime or of these resources in certain geographic regions, by particular racial or ethnic groups, and by labor trafficking survivors, can lead to significant underreporting. Nonetheless, this information spotlights where and how traffickers operate so that we can put them out of business, keep them from harming more people, and help survivors find the services they need. 
View the fact sheet here!