On August 4, 2011, the U.S. Census Bureau released Summary File 1 (SF1) for Illinois. This is the fourth release of 2010 Census data following earlier releases of population count for apportionment, redistricting files provided to each state to use for drawing legislative boundaries, and demographic profiles. SF1 provides the most detailed data yet from the Census 2010, including new housing and home ownership data, population counts for reach and ethnicity (including detailed race and Hispanic or Latino origin groups), expanded data by age and sex, and relationship of household members to householder.

Selected 2010 SF1 results for CMAP Counties, County Subdivisions (Townships), and Places can be found here (Excel, 265 Kb).  See the CMAP 2010 Census page and Policy Updates blog for detailed analysis.   The 2010 Census page includes Cook, DuPage, Lake, Kane, Kendall, McHenry, Will counties, as well as the City of Chicago, suburban Cook county, and a seven-county regional total. You can also download a glossary of terms.  Regional data tables available for download include housing unit counts and tenure, as well as vacancy rates. 

The previous data release focused on demographic profiles.  Visit the Census 2010 website for an introduction to the profiles. Demographic profiles can be found on the Census Bureau's AmericanFactFinder website.  Follow these steps to find data for your home town.

• At "Quick Start" enter city or village (such as Anytown, IL) then "Go"
• Check the box for DP-1, Profile of General Population and Housing Characteristics: 2010
• Select either "View" or "Download"

The Interactive Population Map allows you to choose one of the 5 subject areas, Total Population, Race, Ethnicity, Age/Sex, or Household, and then enter your city for details.

Census 2010 and Census 2000 data for places (a designation which includes both cities and villages) within the region are now available.  The most current 2010 Census population and housing unit data for the 7 counties in our region together with Census 2000 and 1990 Census data are available here.  The table also shows the amount of change between successive decades.  Census population totals for all municipalities in the region for each decade from 1950 through 2010 are also provided. 
 

Interactive Maps

The Census Bureau delivers redistricting data to the state's leadership. On confirmation of delivery the Census Bureau publishes a news release with five data tables and a Redistricting Data Interactive Map (below).  This graphic shows, for example, 2010 Decennial Census population totals by state and county, county decennial population since 1960 and percentage of population change by race.

Data provided by U.S. Census Bureau. 

• - Represents zero or rounds to 0.0
• The term "county" refers to county or equivalent entity.
• For more information on Substantial Changes to Counties and County Equivalent Entities: 1970-Present, please visit http://www.census.gov/geo/www/tiger/ctychng.html. 
   

Scrolling down reveals another interactive map (screenshot below) with summarized apportionment data for all 50 states and Puerto Rico. (Apportionment is the equitable distribution of congressional seats to all 50 states).  The graphic also provides population change and population density change for every decade since 1910. All data can also be chosen in HTML format and can be downloaded in .CSV (Comma Separated Value - spreadsheet) formats.

 

Media Advisory Page

The Census Bureau Media Advisory Page  announces upcoming data releases for the 50 states. The most recent release, on August 4, 2011 concerns the fourth release of data for Illinois. Releases include population totals and data by race, Hispanic/Latino original and voting age. Data for states are presented for counties, cities, school districts, voting districts, census tracts and census blocks.

The U.S. Census Bureau uses the following definitions:

• Census tract is defined as a small, relatively permanent statistical subdivision of a county delineated by a local committee of census data users for the purpose of presenting data. Census tract boundaries normally follow visible features, but may follow governmental unit boundaries and other non-visible features in some instances; they always nest within counties. Designed to be relatively homogeneous units with respect to population characteristics, economic status, and living conditions at the time of establishment, census tracts average about 4,000 inhabitants. They may be split by any sub-county geographic entity.
• Census block - A subdivision of a census tract (or, prior to 2000, a block numbering area), a block is the smallest geographic unit for which the Census Bureau tabulates 100-percent data. Many blocks correspond to individual city blocks bounded by streets, but blocks -- especially in rural areas -- may include many square miles and may have some boundaries that are not streets. The Census Bureau established blocks covering the entire nation for the first time in 1990. Previous censuses back to 1940 had blocks established only for part of the nation. Over 8 million blocks are identified for Census 2000.
• For other definitions, navigate to the U.S. Census Bureau Glossary.
  
   

Getting data from the Census Bureau website

American FactFinder 2 (AFF2) is the Census Bureau's updated website for 2010 Census data. Choose either English or Spanish language versions. Data can be downloaded in Database-compatible formats (Comma delimited .csv, or Excel .xls), or in Presentation-ready formats (Excel .xls, or PDF).

For a quick start using AFF2, select "Using Factfinder" at the top of the page. Tutorials are available from this link. The website format is substantially different from Legacy American FactFinder, which includes 1990 and 2000 decennial census data and the latest estimates from the American Community Survey.  Legacy American FactFinder does not provide 2010 Census data.

The Redistricting Data Press Kit includes these features:

• Summaries of the 4-step process for releasing Redistricting Data
• List of states that will next receive data and list of states for which data have already been released
• Data table shells (spreadsheet templates) that come with news release by state
  • Most Populous Counties And Places In The State Ranked For 2000 And 2010
  • Population By Race And Hispanic Or Latino Origin, For All Ages And For 18 Years And Over For 2000 And 2010
  • Population By Race Alone Or In Combination And Hispanic Or Latino Origin, For All Ages And For 18 Years And Over For 2000 And 2010
  • Population By Race, Including All Specific Combinations Of Two Races For 2010
  • The Most Populous Counties And Places By Race And Hispanic Or Latino Origin For 2010
  • Full data set with data for these categories
    • Race
    • Hispanic Or Latino, And Not Hispanic Or Latino By Race
    • Race For The Population 18 Years And Over
    • Hispanic Or Latino, And Not Hispanic Or Latino By Race For The Population 18 Years And Over
    • Occupancy Status (Housing) – Occupied Or Vacant
  • Census 2000 Redistricting Data
     

General Information

Public Law (P.L.) 94-171 requires the U.S. Census Bureau to provide the Governor and majority and minority leaders of each state with local census data needed for legislative redistricting. Participation in the redistricting program, however, is voluntary.

Phase 3 of the redistricting program is currently underway during which states receive data from the 2010 decennial census. States may then suggest reconfigured boundaries for voting district and state legislative boundaries. Phase 3 activities take place during years 2010–2011.

Phase 4 of the redistricting program is the time when the US Census Bureau collects state legislative and congressional (redistricting) plans. Phase 4 occurs in years 2012-2013.

Download a short description of the redistricting program. More detailed documentation is available through additional publications.