Based on the historical population data for the ZIP code 62440 in Lerna, Illinois, the area has experienced a gradual decline in population and population density over the past decade. In 2010, the population was 2,151, with a density of 48.56 people per square mile. By 2022, the population had decreased to 1,701, with a density of 38.4 people per square mile.

With a land area of 44.3 square miles and a population density consistently below 50 people per square mile, this ZIP code can be classified as a remote rural area. The lifestyle in such areas is typically characterized by large expanses of land per household, often more than 5 acres, and a focus on privacy and self-sustainability. The predominant land use is likely to be agricultural or undeveloped, with residents engaging in outdoor and recreational activities due to the natural environment.

The estimated number of housing units corresponding to the 2022 population is 651, based on the national average household size of 2.61. This suggests that the area has a relatively low housing density, consistent with the remote rural classification.