AHC: Other Singapore style City States

Gibraltar's been mentioned a few times, but Ceuta has only come up once (brief mention by @Diforto in post 13). It's not as defensible as Gibraltar, but a bit bigger and obviously in just as good a location trade-wise. It was a free port up to as recently as 1986 (when Spain joined the EEC), so some extra chaos in Spain at some point could lead to it going it alone - maybe as a result of one of the Carlist Wars?
The problem would be keeping it independent from Morocco without the Spanish to support it.
The same could apply to Melilla too.
 
What about Brussels in a TL where Belgium is split between France and the Netherlands on linguistic lines? Brussels left as a neutral buffer due to her mixed population and acts as trade entrepot between the two powers.
 
One candidate I'm surprised I don't see people talking about is Pressburg/Bratislava. In 1918 the leaders of Pressburg (which at the time was mixed-ethnicity: majority German, second-largest group Hungarian) declared Pressburg a free city. It continued to operate as a free city until it was forcefully integrated into Czechoslovakia in 1919.

FYI: https://www.alternatehistory.com/forum/threads/ministates-pressburg.412437/ (yes, it's post-1900 - hard to see independent Pressburg before A-H breaks up).
 
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