Hamilton County is a county in the U.S. state Nebraska. As of the 2020 United States Census, the population was 9,429. Its county seat is Aurora. The county was named for Alexander Hamilton, the first Secretary of the Treasury in the new United States government.

Polk County is a county in the U.S. state of Nebraska. As of the 2020 United States Census, the population was 5,214. Its county seat is Osceola. The county was formed in 1856, and was organized in 1870. It was named for President James K. Polk.