Unemployment Rate in Mercer County, PA was 4.20% in December of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in Mercer County, PA reached a record high of 16.90 in April of 2020 and a record low of 3.30 in November of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Mercer County, PA - last updated from the United States Federal Reserve on April of 2026.