Cost of Living in Oak Brook, IL

With a cost of living index of 196, Oak Brook, IL is one of the most expensive cities in the United States. Living here is 96% more expensive than the national average and 116% above the Illinois state average of 80. Oak Brook is a smaller community of 8,028 residents, where everyday costs can differ substantially from nearby larger cities.

Housing costs are the biggest factor in Oak Brook's cost of living. The median monthly rent is $2,921 (121% above the US median of $1,319), and the median home value sits at $867,900 (185% above the national median of $304,900). At current prices, the median home costs roughly 5.1x the median household income — a stretch for many buyers, though not uncommon in today's market.

The median household income in Oak Brook is $171,123, which is 128% higher than the national median of $75,149. Residents spend roughly 20% of household income on rent. This is a comfortable ratio, well below the 30% threshold that financial experts recommend as a maximum. While incomes are above average, they more than offset the higher cost of living.

Climate is another factor for anyone considering a move to Oak Brook. The area sees an average annual temperature of 52.1°F, with summers averaging 74°F and winters around 29°F. Annual rainfall totals 34.4 inches spread over roughly 121 days. Cold winters mean higher heating bills, an important cost-of-living consideration.

Everyday prices in the Chicago-Naperville-Elgin, IL-IN (Metropolitan Statistical Area) metro area tend to run above the national average. Out of 6 common grocery and utility items tracked by the Bureau of Labor Statistics, 5 are priced higher than the US average. These real-world prices — from groceries to electricity — add up and should be factored into any cost of living comparison.

Data sources: US Census Bureau (ACS 2023), Zillow Home Values, HUD Fair Market Rents, BEA Regional Price Parities, BLS Average Prices, and NOAA Climate Normals. Updated monthly.