There are 7 US Post Offices in Ringgold County serving a total of 4,874 residents equating to 696 residents per post office. It's estimated that approximately 7,779 packages are handled across the 7 county post offices annually. Ringgold County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 5,131, making it the second-least populous county in Iowa. The county seat is Mount Ayr. The county is named after Maj. Samuel Ringgold, a hero of the Battle of Palo Alto fought in May 1846, during the Mexican-American War. It is one of the 26 Iowa counties which has a name not shared with any other county in the United States."