Ensuring that every person in the United States is counted once, only once, and in the right place is a vital goal of the decennial census. For many decades, the U.S Census Bureau has evaluated coverage in each census and documented that people are typically missed in the census. These people are referred to as census omissions. The Census Bureau has also documented that people are counted in the wrong place and found evidence that people are counted more than once during the census. Both of these errors are referred to as erroneous enumerations.

During the Coverage Followup operation, telephone interviews were conducted with certain respondents to determine if changes should be made to their household roster as reported on their initial census return. The questions asked during the telephone interview probed to identify if people were missed or counted in error, and to collect missing demographic data for all persons in the household.

The purpose of this assessment is to document many aspects of the Coverage Followup operation. It looks at the cases selected for the operation, documents the success at completing cases, describes the households with roster changes, and profiles the persons added to or deleted from household rosters.

Data in this report may not match data in other Coverage Followup reports due to differences in various data sources. Caution is advised when directly comparing number s between Coverage Followup reports.