There are 7 US Post Offices in Fillmore County serving a total of 5,775 residents equating to 825 residents per post office. It's estimated that approximately 9,218 packages are handled across the 7 county post offices annually. Fillmore County is one of 93 counties in the U.S. state of Nebraska. As of the 2010 census, the population was 5,890. Its county seat is Geneva. The county was named for President Millard Fillmore."