Illinois Snapshot
$84
Avg AGI per Return in Illinois
6,001,440
Total Tax Returns in Illinois
1,228
ZIP Codes With Income Data
Last updated May 2, 2026.
How Illinois compares
Illinois
$84
National Average
$83
Illinois's avg agi per return is about the same as the national average.
These are the 10 highest-income ZIP codes in Illinois, ranked by average adjusted gross income per tax return from IRS Statistics of Income. Click any ZIP code for the full local snapshot.
FAQ
How many ZIP codes does Mubboo track in Illinois?
Mubboo tracks 1,228 ZIP codes in Illinois via the U.S. Census ZCTA basemap. Use the search box above to look up data for any specific ZIP.
How does Illinois's average adjusted gross income per tax return compare nationally?
Illinois's average adjusted gross income per tax return is higher the national average. See the "How Illinois compares" callout above for the precise side-by-side comparison.
How fresh is this data?
Mubboo refreshes each data source on its native cadence — HUD Fair Market Rents annually (October), Tax Foundation tables annually, and federal datasets per their published schedules. Each page caches for 24 hours via ISR. See our methodology page for details.
Data sources: IRS Statistics of Income, Census ZIP Business Patterns, BLS Quarterly Census of Employment and Wages, BLS Local Area Unemployment Statistics. Mubboo refreshes each source on its native cadence (HUD annually, Tax Foundation annually, etc.). See our full methodology →
More Illinois data: