Resident Population in Rockford, IL (MSA) was 337.10300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Rockford, IL (MSA) reached a record high of 353.72200 in January of 2009 and a record low of 321.04200 in January of 2000. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Rockford, IL (MSA) - last updated from the United States Federal Reserve on April of 2026.