Based on the historical population data provided for ZIP code 21677 in Madison, Maryland, the area has experienced fluctuations in population and population density over the past decade. The population ranged from a low of 134 in 2010 to a high of 197 in 2015, with the most recent data point in 2022 showing a population of 167. The corresponding population density has also varied, with the 2022 figure at 22.24 people per square mile.

Given the ZIP code's size of 7.51 square miles and the 2022 population density, the area can be classified as remote rural. Remote rural areas are characterized by very sparse populations, minimal infrastructure, and limited services. The lifestyle in such areas is predominantly agricultural or undeveloped, with a focus on privacy and self-sustainability. Residents often engage in outdoor and recreational activities due to the natural environment.

The estimated number of housing units corresponding to the 2022 population is approximately 64, based on the national average household size of 2.61. This suggests that the area is sparsely populated, with large expanses of land per household, which is typical of remote rural areas.