The Illinois State Association of Counties (ISACo) submitted formal comments to the U.S. Census Bureau on November 2, 2026, expressing concerns about proposed changes to residence criteria, population classifications, and demographic data collection for the 2030 Decennial Census. ISACo's comments emphasize the importance of accurate and comprehensive census information for Illinois' 102 counties, particularly its role in federal and state funding allocations, congressional representation, county redistricting, infrastructure planning, and the delivery of essential public services. The Association also raises concerns about increased reliance on administrative records, potential population undercounts, and the availability of reliable demographic information. ISACo urges the Census Bureau to withdraw or substantially modify the proposed rule to preserve census accuracy and ensure that county governments have the information necessary to serve their communities effectively. Click on the title to read the letter.