Prospect Park South, a Brooklyn neighborhood, exhibited population stability from 2010 to 2022, maintaining approximately 25,000 residents. A significant decrease occurred in 2020, with the population falling to 22,994. This decline was quickly reversed, as the population increased to 25,516 in 2021 and 25,535 in 2022.

The population density of Prospect Park South reached 76,279.91 people per square mile in 2022. This high density classifies the area as an ultra-urban environment, characterized by compact living spaces and developed urban infrastructure. The density suggests a prevalence of multi-story apartment buildings and limited personal space, typical of New York City's urban areas.

The neighborhood's proximity to Prospect Park provides residents access to green spaces, a valuable feature in a densely populated area. This combination of high urban density and nearby parkland creates a unique living environment, offering both urban conveniences and outdoor recreation opportunities.