Seeing the *.k12.oh.us in the delegated subdomains brought me back to highschool. When I was little I always wondered why the city name was before k12. Didn't know it was structured like that everywhere.
I managed a couple ".k12.oh.us" domains back in the day. The employees hated the domain in their email addresses, but I found it very logical. I saw all kinds screwed-up addresses in bounce messages forwarded to my company address when "can't email people in the District" tickets got sent my way (a lot of "districtname.oh.k12.us", etc). I guess it wasn't so simple for "normies".
One of the schools ended up using a ".com" domain that was one character longer than their ".k12.oh.us" domain but easier to tell people verbally (I guess).
I also managed a "co._countyname_.oh.us" domain, too. Again, universal hatred for the domain in email addresses, and again I found it logical and reasonable.
The County government ended-up getting a ".gov" domain that was 5 characters longer than their "co._countyname_.oh.us" domain and, in my opinion, hell to tell people verbally ("It's Countyname County Ohio dot Gov. Yes-- all one word. The words County and Ohio are spelled out. No, not O-H-- Ohio is spelled out." >sigh<)
mayo.k12.sc.us was my high school. It seems a shame they're not still using it.
Seeing the .k12.oh.us in the delegated subdomains brought me back to highschool.*
When I was in my wandering days before there were search engines, I would always enter http://travel.state.*st*.us, or http://travel.*st*.us to look up tourism web sites.
It was unusual for a city or state to not have a travel.city.state.us, or travel.state.us domain.
Our school and town dropped all the .mi.us domains and they have their own domains now, why would they do that? I know it used to be k12 too.
School districts are often supersets of municipalities.