Unemployment Rate in Grundy County, IA was 2.90% in December of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in Grundy County, IA reached a record high of 8.50 in April of 2020 and a record low of 1.60 in October of 1999. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Grundy County, IA - last updated from the United States Federal Reserve on April of 2026.