Census 2000 Data and Adjusted Data
 
 
 
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Over/Undercount

Map Width 3,000 Miles
map legend
  Print This Map Display Initial Map Click on the Map to Recenter the Map Click on the Map to Zoom Out Click on the Map to Zoom In Click on the Map to Get Information about Locations  
   
   

ABOUT THE APPLICATION
This map application lets you see and query the differences between the Census 2000 population data and Census 2000 adjusted population data. Use the zoom and pan tools to move around the map and see population under and overcounts. At the national scale, the map shows undercounts by state (undercounts are computed by subtracting the Census 2000 population value from the Adjusted Census 2000 population value). As you zoom in, the map shows over and undercounts by county, then place/county subdivision, and then by Census tract.
 
USING THE APPLICATION
You use the buttons at the top and the links to the left to change the map and get information as follows:
• Initial Map Click this button to return to the initial map and scale
• Pan Click this button and then click and drag on the map to move the map to a new location without changing the scale
• Zoom Out Click this button and then click or click and drag on the map to zoom out
• Zoom In Click this button and then click on the map to zoom in, or click and drag on the map to zoom in to a specific area
• Info Click this button and then click on the map to get Census 2000 data and adjusted data. A pop-up window lists the tract, county subdivision and/or Census place, county, and state found at the clicked location. Information about a found feature is listed below. Click any of the found features links to see its data.
• Change Map Theme Click this link to change the map. A drop-down lists the map themes available. The default map shows the percentage of over/undercounts. You can also choose to map the over/undercount values.
• Change Map Location
Click the link to find a specific location in the United States. A pop-up window is displayed:
To Find: Do This:
A State Choose it from the drop-down list and click Find
A ZIP Code Type it in the ZIP Code box and click Find
A City/Town/Township Type the name in the City or Town box, choose the state from the State drop-down list, and click Find
An Address Type the address in the Street Address box, the ZIP Code in the ZIP Code box, and click Find
• Change Display Layers Click this link and check the boxes next to layers you want to display on the map. Some layers will not be visible at certain map scales.

ABOUT THE DATA
The adjusted numbers contained herein are being released pursuant to the order of the United States Court of Appeals for the Ninth Circuit in Carter v. Department of Commerce, 307 F.3d 1084. These numbers are not official Census 2000 counts. These numbers are estimates of the population based on a statistical adjustment method, utilizing sampling and modeling, applied to the official Census 2000 figures. These estimates utilized the results of the Accuracy and Coverage Evaluation (A.C.E.), a sample survey intended to measure net over- and undercounts in the census results. The Census Bureau has determined that the A.C.E. estimates dramatically overstate the level of undercoverage in Census 2000, and that the adjusted Census 2000 data are, therefore, not better than the unadjusted data.

On March 6, 2001, the Secretary of Commerce decided that unadjusted data from Census 2000 should be used to tabulate population counts reported to states and localities pursuant to 13 U.S.C. 141(c) (see 66 FR 14520, March 13, 2001). The Secretary's decision endorsed the unanimous recommendation of the Executive Steering Committee for A.C.E. Policy ("ESCAP"), a group of twelve senior career professionals within the Census Bureau. The ESCAP, in its recommendation against the use of the statistically adjusted estimates, had noted serious reservations regarding their accuracy.

In order to inform the Census Bureau's planned October 2001 decision regarding the potential use of the adjusted estimates for non-redistricting purposes, the agency conducted extensive analyses throughout the summer of 2001. These extensive analyses confirmed the serious concerns the agency had noted earlier regarding the accuracy of the A.C.E. estimates; specifically, the adjusted estimates were determined to be so severely flawed that all potential uses of these data would be inappropriate. Accordingly, the Department of Commerce deems that these estimates should not be used for any purpose that legally requires use of data from the decennial census and assumes no responsibility for the accuracy of the data for any purpose whatsoever. The Department, including the U.S. Census Bureau, will provide no assistance in the interpretation or use of these numbers.