In the United States, I’d probably name Oregon City, the famous end of the Oregon Trail and the first city founded west of the Rocky Mountains during the pioneer era. Its population is only 37,000.
Gibraltar has a population of 32,000, which by some definitions is too small to be considered a city.
Gibraltar is a city?
I am American, so low bar, but there are dozens of us.
It’s a city, it’s a really big rock, it’s a maritime port, it’s the only wild monkey population in Europe, it’s a 2½ mi2 British Overseas Territory whose status is perennially contested by Spain.