Crystal Lake city, Illinois Demographics & Population 2026

Population Overview

Crystal Lake city is a mid-sized community located in Illinois. The total population is 40,436. It ranks as the 41st most populous out of 1,445 cities and towns in Illinois.

Age Demographics

The median age in Crystal Lake city is 39.5 years. This is 2% higher than the state median of 38.9 years.

Economy, Income & Housing

The median household income in Crystal Lake city is $105,428. This is 29% higher than the state median of $81,702. Compared to the national median of $78,538, household income here is 34% higher. The poverty rate stands at 6.1%. This is 48% lower than the state poverty rate of 11.7%. The unemployment rate is 4.6%. This is 21% lower than the state rate of 5.8%. The median home value is $287,400. Housing costs are 15% higher than the state median of $250,500. With a home-value-to-income ratio of just 2.7x, Crystal Lake city is one of the most affordable housing markets in the area. 78.0% of occupied housing units are owner-occupied. This homeownership rate is 17% higher than the state average of 66.8%.

Race & Ethnicity

The largest racial or ethnic group in Crystal Lake city is White (non-Hispanic), making up 80.9% of the population. Hispanic or Latino residents account for 12.1%. The Black or African American population (0.5%) is well below the state average of 13.6%.

Education

42.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 13% 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 94.8%.

Data Sources & Methodology

All demographic data for Crystal Lake city, 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.