Based on the historical population data for the 08204 ZIP code in Erma, New Jersey, spanning from 2010 to 2022, the area has experienced a gradual decline in population and population density. The population peaked in 2015 at 19,668 and has since decreased to 17,952 in 2022. Similarly, the population density has decreased from a high of 726.56 people per square mile in 2015 to 663.17 people per square mile in 2022.

With a current population density of 663.17 people per square mile, the 08204 ZIP code falls within the suburban rural classification. This suggests that the area features clustered housing developments with typical lot sizes around 1 acre. The lifestyle in this area likely blends rural openness with suburban amenities, making it suitable for families seeking quieter neighborhoods close to nature while still having access to suburban conveniences such as community centers and parks.

The estimated housing units corresponding to the 2022 population, based on the national average household size of 2.61, is approximately 6,878 units. This indicates a moderate level of urban development activity in the area, as the housing stock is sufficient to accommodate the current population.