I've done a little testing (unrealistic, to be sure) to see if there was a hard cap to city size.
There isn't. Seems to be entirely regulated by the amount of food available.
I generated this city by creating a plot of land that had all grassland floodplains with either corn or wheat farms (rice for some reason generates one less food, although the civilopedia doesn't seem to indicate this). 10 food per square times 20 squares plus 3 food for the city square = 203 food = 101 population. Then I plopped down the city, a "helper city" to provide crab/fish/whale, set both to size 21, gave the main city almost all buildings (minus sea buildings plus a couple others), gave the helper city all non-wonder buildings, and started advancing turn by turn.
See attached images...
There isn't. Seems to be entirely regulated by the amount of food available.
I generated this city by creating a plot of land that had all grassland floodplains with either corn or wheat farms (rice for some reason generates one less food, although the civilopedia doesn't seem to indicate this). 10 food per square times 20 squares plus 3 food for the city square = 203 food = 101 population. Then I plopped down the city, a "helper city" to provide crab/fish/whale, set both to size 21, gave the main city almost all buildings (minus sea buildings plus a couple others), gave the helper city all non-wonder buildings, and started advancing turn by turn.
See attached images...
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