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[[File:high density residential zone.jpg|400px|thumb|right|High Density Residential Zone]]

Density in SimCity is the key to high populations and high profit, as well as tons of traffic. High Density is what makes buildings grow into skyscrapers and low Density keeps them in the form of single houses and storefronts. To increase Density you have to increase the area's [[Happiness]], as well as have roads that can support higher densities and that are spaced far enough apart for the higher density building's footprint.

Note: Density and Wealth are completely different things and are not effected by one another, you can have Low Wealth/High Density apartment buildings and High wealth/Low Density mansions. This goes for commercial and industrial zones as well.

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