The 2010 Nonresponse Followup Operation assessment reports the results of four 2010 Census field operations:

• Nonresponse Followup,
• Nonresponse Followup Reinterview,
• Nonresponse Followup Vacant Delete Check, and
• Nonresponse Followup Residual.

All four operations involve census enumerators interviewing and verifying the status of housing units in areas that received a mailback 2010 Census questionnaire but did not respond by mail.

The Nonresponse Followup Reinterview operation was a quality control check on the Nonresponse Followup enumerators’ work.

The Nonresponse Followup Vacant Delete Check operation verified Nonresponse Followup vacant and nonexistent housing units. In addition to the housing unit verification, the Nonresponse Followup Vacant Delete Check Operation included a first time enumeration of housing units.

The Census Bureau developed the Nonresponse Followup Residual operation while Nonresponse Followup was in the field when Census Headquarters staff noticed there was potentially a large number of occupied housing units that lacked information about the number of people living in the housing unit. Nonresponse Followup Residual was the last attempt to complete a full interview for occupied housing units with no information about the number of people living there. Nonresponse Followup Residual also included enumeration of housing units for which we were missing data capture information.