The Census field work is really in two parts:
1. A census of residences, where maps from the previous census are reviewed and updated using various records, and some census workers also do field work. That took place in late 2009 and early 2010.
2. The forms are sent out after that is completed, to all the residences, and the returned forms are entered into computers.
3. Then census workers go out to visit the residences (addresses) for which the form was not returned.
Yep, ‘cept your #1 took place just about a year ago.