No, not all of heavily populated are same classified as overpopulation, they get plenty of idea to make enough room for population to growing, such as build taller apartment buildings in NYC.
Overpopulation issue would be China because they adopted 1 child policy in 1979 and haven't heard about India.
Outside of NYC, NY got plenty of land, same goes with CA for outside of numerous metro.
Otherwise, overpopulation would become issue if population is already over the housing capacity, there's probably no data to count on it for cities and I couldn't say if it's overpopulation or not.
