There are 3 US Post Offices in Adams County serving a total of 3,811 residents equating to 1,270 residents per post office. It's estimated that approximately 6,083 packages are handled across the 3 county post offices annually. Adams County is a rural county located in the state of Idaho. As of the 2010 census the county had a population of 3,976, making it the fifth-least populous county in Idaho. The county seat and largest city is Council. The county was established in 1911 and was named in honor of President John Adams. Adams County is home to the Brundage Mountain ski area, northeast of New Meadows, and the Idaho ground squirrel."