The ZIP code 15234, located in Castle Shannon, Pennsylvania, has experienced gradual population growth over the past decade, with the population increasing from 14,927 in 2010 to 15,192 in 2022. The population density has also risen accordingly, from 4,509.67 people per square mile in 2010 to 4,589.73 people per square mile in 2022. Given the ZIP code's size of 3.31 square miles and the national average household size of 2.61, the estimated number of housing units corresponding to the 2022 population is 5,820.

Based on the population density data, this ZIP code falls into the urban category, characterized by densities between 3,000 and 10,000 people per square mile. Urban areas typically feature a mix of multi-story residential buildings, commercial establishments, and a high level of infrastructure and services. The lifestyle in such areas is often fast-paced, diverse, and culturally rich, catering to individuals and families who enjoy the vibrant city life with access to extensive public transportation, restaurants, theaters, and museums. Living spaces in urban areas are generally smaller compared to suburban or rural areas, ranging from 500 to 1,000 square feet.