Based on the historical population data for ZIP code 61951 in Sullivan, Illinois, spanning from 2010 to 2022, the area has maintained a relatively stable population, fluctuating between approximately 7,800 and 8,200 residents. The population density has also remained consistent, ranging from 59.71 to 62.62 people per square mile over the 12-year period.

Given the ZIP code size of 130.64 square miles and the 2022 population of 7,988, the current population density stands at 61.15 people per square mile. This low population density suggests that the area is primarily rural, characterized by large expanses of land per household and a predominantly agricultural or undeveloped landscape. The lifestyle in such areas typically focuses on privacy, self-sustainability, and outdoor recreational activities, with minimal infrastructure and limited public services.

Estimating the number of housing units in the ZIP code based on the 2022 population and the national average household size of 2.61, there are approximately 3,061 housing units in the area. This relatively low number of housing units spread across the 130.64 square miles further supports the rural nature of the region.