Comment by toast0

> Is it possible to register e.g. X.ca.us domains today? What are the criteria required to do so?

I don't think so. Godaddy won't delegate new third level domains, and I don't think the second level (states) were ever delegated?? But if you can find a city.ca.us that is delegated and that person/organization is willing to register a new name, you could maybe do that.