I worked for the census this year for about 3 weeks in the month of August. I think the importance of the census is lost on a lot of people, but an accurate count is essential for policymakers to make the case for expanding services in our neighborhood. Census counts determine the degree of federal, state, and even city funding to schools, hospitals, libraries, community centers, and even streets. I wanted to do my part though I ended up leaving in late August, partially because I was starting a new job, but also partially because I was frustrated with the chaotic and disorganized nature of how the census conducted its work.
Return visits are a pretty routine part of the census and our conducted mostly for quality assurance, but I frequently found that the system was giving me excessive return requests for the same handful of addresses. Enumerators use an app that is supposed to tell them whether or not the return visit is for quality assurance or to collect missing information. however, the app is not particularly well constructed, and many enumerators are poorly trained. In my three weeks of work I had four different supervisors who often gave me conflicting information on the best way to proceed when the app gave confusing instructions.
I know it's probably annoying to have a repeat visitor asking you personal questions after you have already provided the necessary information. If I were you, I would try to explain the situation to the worker and be as understanding as possible, since the enumerator is basically following instructions that are poorly defined. Nonetheless, the results of these counts are deeply important, especially for a neighborhood like ours where services are often not sufficient to serve the need.