There are 10 US Post Offices in Renville County serving a total of 15,962 residents equating to 1,596 residents per post office. It's estimated that approximately 25,477 packages are handled across the 10 county post offices annually. Renville County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 15,730. Its county seat is Olivia. The county was formed in 1855 and organized in 1866."