I can't find this mentioned in the documentation (manual, readme, Civilopedia), although HalfLotus has posted it as well in the Strategy forum.
Color of city population number:
Red - Not enough food to support population. City will lose one population when food storage box exhausted.
Yellow - Stagnant or zero growth. City produces just enough food to support existing population.
White - Surplus. City will grow by one when food storage box filled.
Color of city population number:
Red - Not enough food to support population. City will lose one population when food storage box exhausted.
Yellow - Stagnant or zero growth. City produces just enough food to support existing population.
White - Surplus. City will grow by one when food storage box filled.
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