Cheapest Cities in Illinois

Where the Affordability Lives in Illinois

The most affordable metro inside Illinois is Decatur, IL with an overall Regional Price Parity of 88.4, 11.6% below the national average of 100. Goods there index at 93.6, services at 91.1, and rents at 56.2 — and because rents carry the heaviest weight in the BEA formula, the low rent figure is typically what anchors a metro into the cheapest tier for its state.

Across the 8 lowest-cost Illinois metro areas in this ranking, the average overall index is 93.8 and the average rent index is 76.6. 7 of these 8 metros sit below the U.S. national average, which tells you how much of a discount these areas really deliver relative to the country as a whole. The gap from Decatur, IL (88.4) up to Chicago-Naperville-Elgin, IL-IN (103.6) inside this affordable list is 15.2 index points — a meaningful spread even among "cheapest" metros.

Translated into household budget, a nationally-priced $100,000 lifestyle in Decatur, IL costs about $88,422, leaving room for savings, housing quality upgrades, or lower work hours compared to high-cost coastal metros. Keep in mind that a low RPP does not automatically mean low local wages — local earning potential, commute distance, school quality, and property taxes all stack on top of the BEA price index. For anyone considering relocation inside Illinois, these cheapest metros are the right starting list, but always validate with rent tables and salary data specific to your occupation before committing.