The significant delay of the release of 2020 census data as well as politics surrounding the count have created problems for lawmakers deciding how to draw Illinois’ legislative maps. Normally, there is little debate over which data to use. The census data is available and used by lawmakers to understand how the state’s population has changed over the last decade. This year, factors including the pandemic and policies by the Trump administration, have delayed the release of the full census data until late summer. It has left lawmakers quarreling over whether they should use the census data or the American Community Survey data.