Chosen at random it's legit if it came from the census dept of commerce. It in theory is IS required by law that you provide answers. As a farm owner, I get these all the time from the Dept of Agriculture. They will dog you forever if you don't send it back, letters, telephones, visit in person, etc

It's a relatively benign collection of data for statistical purposes. No one that I'm aware of is individually identified. The governments big brother features are far more overrated than fellow paranoid travelers would have us believe. As a many decade systems analyst, IT person, they are just not that competent. Whatever God you believe in help us if they ever do get that competent (we'll need all the help we can get).

Rev. Dr. G. Church of the Sub-Genius
It doesn't take a genius