Herrin is a city in Williamson County, Illinois. It is part of the Carbondale-Marion-Herrin Micropolitan Area in Southern Illinois. The population was 12, 501 at the 2010 census. 

The city is named after its first permanent settlers Isaac Herring and his son-in-law, David Herrin. It was originally called Herrin's Prairie.  

City Website: http://www.cityofherrin.com