All Employees: Federal Government: U.S. Postal Service in Illinois was 27.20000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, All Employees: Federal Government: U.S. Postal Service in Illinois reached a record high of 46.60000 in January of 1999 and a record low of 27.10000 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Federal Government: U.S. Postal Service in Illinois - last updated from the United States Federal Reserve on April of 2024.