The Tractor Supply Company has over 1000 locations across the USA, but it is based in Brentwood, Tennessee. However, the 4Health Dog Food is manufactured in the three Diamond Pet Food plants located in Meta, Missouri, Lathrop, California, and Gaston, South Carolina.    Most importantly, Diamond's plants are GMP (Good Manufacturing Practices)-certified, and you can find all of the different 4Health dog food and cat formulas across the country in Tractor Supply Company stores.