It's not permanent, I think. Waco at one point was not on the list either. It's when there are no providers listing themselves in that particular area. If a girl posts in CS again, it will appear on the list.
On the client side, we don't list cities that don't have any providers listed. However, when a provider signs up or edits her add, she see all of those cities as an option.
Yeah, it was a bit of a panic moment for me too, lol. I talked to P411 support about it, it just doesn't show up if no providers are there for the clients.