Based on the historical population data provided for the ZIP code 60045, which corresponds to Lake Forest in Illinois, the area can be classified as a Suburban Rural region. The population density in this ZIP code has consistently hovered around 950 to 980 people per square mile over the past decade, with the most recent data point in 2022 showing a population density of 974.6 people per square mile.

This population density suggests that Lake Forest offers a lifestyle that combines the openness of rural living with the amenities of suburban areas. Residents in this ZIP code likely enjoy larger living spaces, typically around 1 acre, compared to more densely populated suburban or urban areas. The relatively low population density also indicates the presence of open spaces, such as parks or natural areas, which contribute to a more relaxed and nature-oriented lifestyle.

The stable population growth in the ZIP code over the years, with an increase from 21,144 residents in 2010 to 21,295 in 2022, suggests a steady demand for housing and a growing community. The estimated number of housing units corresponding to the 2022 population, based on the national average household size of 2.61, is approximately 8,159 units. This indicates a moderate level of urban development activity in the area to accommodate the gradually increasing population.