Resident Population in Polk County, NE was 5.22800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Polk County, NE reached a record high of 6.50000 in January of 1971 and a record low of 5.07700 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Polk County, NE - last updated from the United States Federal Reserve on May of 2024.