This isn’t the full census, just a small subset. And the canvassers can be persistent if you are selected to participate. Not only repeated direct visits, but also repeated calls. Call me cynical but I find it suspicious that only what would be embarrassing bad new responses seem to be left out here.
Now I understand why the stupid canvasser kept coming to my home last year. No fewer than four visits and notices on my door. I refused to answer the door in the same way I refused to answer the census via form. I repeatedly threw forms, mails, letters threatening to fine me if I didn't respond right in the garbage. IDGAF about the census. Never have, never will. It's about the only way I have anymore to tell the government to shove it straight up their arse.