There are 2 US Post Offices in Trego County serving a total of 2,608 residents equating to 1,304 residents per post office. It's estimated that approximately 4,163 packages are handled across the 2 county post offices annually. Trego County (standard abbreviation: TR) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 3,001. Its county seat and largest city is WaKeeney."