* The IRR ranges between 0 (low level of rurality, i.e., urban, red counties in the map) and 1 (most rural, blue counties in the map).  

** This project was supported by the Agricultural and Food Research Initiative Competitive Program of the USDA National Institute of Food and Agriculture (NIFA), grant number 2020-67019-30772. 

*** Please download 2020 index from here: https://zenodo.org/records/7675745