The Upper West Side contains cultural institutions such as Lincoln Center and the American Museum of Natural History. Its proximity to Central Park likely contributes to its appeal despite population fluctuations. The neighborhood's high population density suggests continued demand for its urban amenities and location.

Residents of the Upper West Side typically inhabit compact spaces in high-rise buildings. The area is characterized by access to public transportation, dining and shopping options, and street life. The high density implies a fast-paced urban experience with proximity to diverse opportunities.

In conclusion, the Upper West Side maintains its ultra-urban character with population densities consistently above 100,000 people per square mile. Despite fluctuations, the neighborhood's population has remained relatively stable over the past decade.