Based on the historical population data provided for ZIP code 21409 in Cape St. Claire, Maryland, the area has experienced steady population growth over the past decade, with the population increasing from 18,722 in 2010 to 20,143 in 2022. The population density has also increased during this period, from 1,202.44 people per square mile in 2010 to 1,293.71 people per square mile in 2022.

Given the ZIP code's size of 15.57 square miles and the 2022 population density of 1,293.71 people per square mile, the area can be classified as suburban. Suburban areas typically feature a mix of residential types, including single-family homes, townhouses, and some multi-family dwellings, with lot sizes ranging from 0.25 to 1 acre.

The lifestyle in this suburban area is likely to be family-oriented, with good access to schools, parks, and shopping centers. The community life may be active, with residents participating in sports leagues, homeowners associations, and local festivals. The estimated 7,718 housing units corresponding to the 2022 population, based on the national average household size of 2.61, further support the notion of a predominantly family-oriented demographic.