Chicago-Naperville-Elgin vs Decatur

What This Comparison Actually Tells You

The Bureau of Economic Analysis indexes Chicago-Naperville-Elgin, IL-IN at an overall Regional Price Parity of 103.6 and Decatur, IL at 88.4, using the U.S. national average of 100 as the reference point. That puts Decatur 14.6% less expensive than Chicago-Naperville-Elgin on a blended basket of goods, services, and rents. The raw index gap of 15.2 points matters more than the headline comparison because it flows directly into salary-equivalent math that families use for relocation, job offers, and remote-work arbitrage decisions.

Inside the breakdown, Chicago-Naperville-Elgin indexes goods at 107.3, services at 83.6, and rents at 112.0, while Decatur comes in at 93.6, 91.1, and 56.2 on the same three categories. The rent line carries the largest weight in the BEA methodology, so a metro with a higher rent index almost always ends up more expensive overall - Chicago-Naperville-Elgin carries the heavier rent load here, and that tends to dominate household budget experience on the ground.

In salary terms, a $100,000 income in Chicago-Naperville-Elgin has the same purchasing power as $85,354 in Decatur based on these indexes. The two metros serve populations of roughly 9,359,555 (Chicago-Naperville-Elgin) and 102,591 (Decatur), and median household incomes are $88,850 versus $62,449 respectively - so the right way to read this comparison is never the index alone, but the ratio of your expected local salary to the rent and services mix. For any serious relocation or remote-work decision, pair this BEA comparison with BLS occupation-specific wage data, HUD Fair Market Rent tables, and state tax treatment before committing.