In Virginia we have indipendent cities insted of counites if there big enough.
It's not based on size. For instance, Blacksburg has a population of slightly over 18,000 more than Fairfax, but the former is a Town while the latter is a City.
The closest that I know of is Carson City, which I guess would be more of a city-county. It's not part of any county of Nevada.
I was going to mention Virginia, but got beat to it. Baltimore is the only other city
I know of with that status.
In Germany they have several "City States", such as Berlin, Bremen, and Hamburg. What cities in the United States could be made into "City States", as in still part of the country but counted as their own individual state. When would the most likely period for this to happen be?
I saw a thread a while back about what if states were limited to population of <1 million. Makes no sense to me, but maybe somebody could work with it.
IMO, only chance for this kind of thing is either colonial/Revolutionary, so you'd probably get more discussion in pre-1900.
I think the best chance is if colonial charters are granted to cities, either through a company setting up cities on a trade nexus or for fishing/whaling
or if there was more royal involvement in the colonies, granting more specific charters. As interesting as that thought is, though possibly impractical, I will comment further on the first. Problems I have with that are, first, that any good trade spots will probably be claimed already. Maybe if something was set up in a disputed area (like the Maryland/Pennsylvania border) or if a stupid king gave already chartered land away. That might work if the land is very undeveloped or mismanaged. Second, food would be a major issue. It would require either vigorous trade or having enough land to build farms. Another stupid king option is if a company was given an exclusive trade charter with a colony, and establishes a city to trade from. Any of these options has potential for intense weirdnes in the Revolutionary era.