Based on the historical population data provided for the ZIP code 19081 in Swarthmore, Pennsylvania, spanning from 2010 to 2022, it is evident that the area has consistently maintained a population density within the range of 4,700 to 5,100 people per square mile. This population density situates Swarthmore in the urban classification, which is characterized by a mix of multi story residential buildings, commercial establishments, and a high level of infrastructure and services.

Over the 13 year period, the population in the 2.27 square mile area has remained relatively stable, fluctuating between 10,776 and 11,524 residents. The most recent data from 2022 indicates a population of 11,524, with a corresponding population density of 5,076.65 people per square mile. This stability in population growth suggests that the area has reached a mature stage of urban development, with a well established community and infrastructure.

Given the national average household size of 2.61, the estimated number of housing units in Swarthmore for the year 2022 is approximately 4,415. This estimation aligns with the urban lifestyle, where living spaces are typically smaller, ranging from 500 to 1,000 square feet, to accommodate the higher population density.