There are 4 US Post Offices in Garfield County serving a total of 1,112 residents equating to 278 residents per post office. It's estimated that approximately 1,775 packages are handled across the 4 county post offices annually. Garfield County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 1,206. Its county seat is Jordan. Garfield County is noteworthy as the site of the discovery and excavation of four of the world's dozen or so major specimens (as of 1994) of Tyrannosaurus rex within the county. A cast of the skull of one of these dinosaurs is on display at the Garfield County Museum."