US CPI for Chicago-Naperville-Elgin (IL-IN-WI)
US CPI for Chicago-Naperville-Elgin (IL-IN-WI) stood at 313.42 in Sep 2026, according to U.S. Bureau of Labor Statistics (BLS) — Consumer Price Index (CPI-U). It is one of the indicators in the CPI by region and metropolitan area table (Value · Monthly), with a complete series running from Dec 1914 to Sep 2026. The complete series with an interactive chart, free to download.
This indicator in the CPI by region and metropolitan area table
| Indicator | 09-2026 | 08-2026 | 07-2026 | 06-2026 | 05-2026 | 04-2026 | 03-2026 | 02-2026 | 01-2026 | 12-2025 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Midwest Region | 314.36 | 311.63 | 310.3 | 310.94 | 312.35 | 308.89 | 306.37 | 303.49 | 301.59 | 300.4 | |
| Chicago-Naperville-Elgin (IL-IN-WI) | 313.42 | 310.89 | 309.46 | 309.92 | 312.87 | 309.36 | 306.59 | 304.49 | 302.22 | 301.16 | |
| Detroit-Warren-Dearborn (MI) | 310.82 | 310.85 | 308.62 | 300.64 | 297.78 |
Understanding US CPI for Chicago-Naperville-Elgin (IL-IN-WI)
This index measures retail price inflation for urban households located in the Chicago-Naperville-Elgin metropolitan area spanning Illinois, Indiana, and Wisconsin. It focuses exclusively on the cost of living within this major midwestern economic hub, distinguishing itself from broader state or division-level metrics by capturing localized urban housing and transit dynamics. It excludes rural areas situated beyond the defined metropolitan boundary.
Published according to a strict calendar, the index is not subject to later revisions, making initial data releases definitive. Because local property tax adjustments, transit fare resets, and winter heating demands create strong seasonal patterns, the most reliable gauge of persistent inflation is the year-on-year change rather than the more volatile month-on-month reading.