Polk County is a county located in the U.S. state of Nebraska. As of 2010, the population was 5,406. Its county seat is Osceola . The center of population of Nebraska is located in Polk County, near the village of Shelby .
In the Nebraska license plate system, Polk County is represented by the prefix 41 (it had the forty-first-largest number of vehicles registered in the county when the license plate system was established in 1922).
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