Decatur, IL vs Round Lake Beach, IL

The cost of living difference between Decatur, IL and Round Lake Beach, IL is dramatic. Decatur is 33.2% cheaper than Round Lake Beach, a gap that translates to thousands of dollars per year in household expenses. Decatur has a cost index of 62 while Round Lake Beach sits at 93, making this one of the more striking comparisons on our site. Relocating between these cities would require a serious reassessment of budget and lifestyle expectations.

On the housing front, median rent in Decatur is $796/month compared to $1,382/month in Round Lake Beach — a 42% difference. Home values follow the same pattern: Decatur is more affordable at $97,300 median vs $191,200.

Median household income in Decatur is $50,809 compared to $86,632 in Round Lake Beach (-41.4%). While Round Lake Beach is more expensive, its higher salaries more than compensate — residents there may actually end up with more disposable income. Looking at affordability, residents of Decatur spend roughly 18.8% of their income on rent, less than the 19.1% in Round Lake Beach.