[mudetroit]

It seems like you are misinterpreting the term housing unit. It isn't the number of buildings. A single apartment in a 200 unit building counts as a housing unit. What this number is telling you is just less than 1 in 5 households in the US live in a building with more than 4 units. I would suspect that the distribution of household size if anything is a bit biased towards single family homes having more people per unit in them if anything.

[chiefalchemist]

Yes. But if I'm not mistaken the unit of measure was internet access. Yes, 1 in X might not be a single family house, but if there were enough units under a single 1 then in theory that could be more total ppl / accnts than single fam home.

Or have I somewhat forgotten what the OP + resulting thread was trying to unpack? Sorry?