Lake Petersburg CDP, Illinois Demographics & Population 2026

Population Overview

Lake Petersburg CDP is a small community located in Illinois. The total population is 769. It ranks as the 781st most populous out of 1,445 cities and towns in Illinois.

Age Demographics

The median age in Lake Petersburg CDP is 59.0 years. This is 52% higher than the state median of 38.9 years. Only 11.8% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in Lake Petersburg CDP is $124,643. This is 53% higher than the state median of $81,702. Compared to the national median of $78,538, household income here is 59% higher. The poverty rate stands at 0.0%. This is 100% lower than the state poverty rate of 11.7%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 2.9%. This is 50% lower than the state rate of 5.8%. The median home value is $336,200. Housing costs are 34% higher than the state median of $250,500. With a home-value-to-income ratio of just 2.7x, Lake Petersburg CDP is one of the most affordable housing markets in the area. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 50% higher than the state average of 66.8%.

Race & Ethnicity

Lake Petersburg CDP has a predominantly White (non-Hispanic) population, comprising 92.2% of all residents. Asian residents account for 3.3%. The White (non-Hispanic) population is significantly higher than the state average (92.2% vs 58.8%). The Hispanic or Latino population (3.1%) is well below the state average of 18.5%.

Education

40.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 9% higher than the state rate of 37.2%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 98.9%.

Data Sources & Methodology

All demographic data for Lake Petersburg CDP, Illinois is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Illinois state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,445 Census-designated places in Illinois. For official data, visit data.census.gov.