Crystal Lake, IL population, income and ZIP codes

Crystal Lake city is a small city in Illinois, with 40,436 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #41 of 1,462 ranked by population — larger than 97% of them. The median age here is 39.5 years against 39.1 nationally, a slightly older profile than the country as a whole. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.

Households in Crystal Lake city earn a median of $105,428 a year, 34.2% above the national figure of $78,538 and 42% above the $74,244 median for the 698 Illinois cities we cover. This figure covers the household, not the worker: two people on ordinary wages at one address outrank a single professional in the same table. Poverty reaches 6.1% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Crystal Lake city is valued at $287,400, 5.3% below the national figure and 60% above the $179,100 peer median, while median gross rent runs $1,431 a month, 1.8% above the national figure, or roughly $17,172 across a full year. A household on the local median income would put about 16.3% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is cheap relative to what people here earn. The home-price-to-income ratio works out to 2.7×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 78% of occupied homes are owner-occupied versus 65% nationally, so the market leans toward owners. Gross rent folds in the utilities a tenant pays separately, so it is closer to the real monthly outlay than a headline rent figure.

No figure on this page is estimated by us; each one comes straight from the published ACS tables for this area. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.