The American Community Survey has been supplementing the Master Address File/Topographically Integrated Geographic Encoding and Referencing database with new Group Quarters as there has been no continuous updating of Group Quarters since the 2000 Census. When 2010 Census operations began to update Group Quarters, we wanted to make sure that the American Community Survey did not continue to supplement Group Quarters that had now been added by these operations. We decided to match the American Community Survey and 2010 Census Group Quarters lists.

Just over 77 percent of the American Community Survey eligible Group Quarters not on the Master Address File/Topologically Integrated Geographic Encoding and Referencing database were matched to records on the Master Address File. There were 34 unmatched Group Quarters that will continue to be eligible for the American Community Survey. These will be included due to their size and the impact on the sample if they were to no longer be represented.

The remaining unmatched Group Quarters will no longer be eligible as we felt the risk of duplication for these Group Quarters was too high.