The historical population data for the zip code 21791 in Union Bridge, Maryland, indicates a rural lifestyle and limited urban development activity. With a population density of 121.94 people per square mile in 2022, the area falls within the rural classification, characterized by larger living spaces, fewer public services, and lower infrastructure density compared to more urbanized areas.

Over the past decade, the population in this zip code has remained relatively stable, fluctuating between 5,528 and 6,093 residents. The population density has also seen minimal changes, ranging from 116.85 to 129.21 people per square mile. This stability suggests that the area has not experienced significant urban development or population growth, maintaining its rural character throughout the years.

Given the national average household size of 2.61, the estimated number of housing units corresponding to the 2022 population is approximately 2,210. This figure, combined with the zip code's size of 47.31 square miles, implies that households in the area likely occupy larger plots of land, consistent with the rural lifestyle.