State profile · IL
Illinois ZIP Codes
Demographics, income, and housing across every ZIP code in Illinois, benchmarked against all 50 states, DC and Puerto Rico.
- 1,383
- ZIP codes
- 12,830,581
- Population
- $80,067
- Avg ZIP income
- 102
- Counties
The verdict
Texas leads ZIP coverage at 1,935 ZCTAs (#1 of 52). That is not the income board: New Jersey's unweighted average ZIP household income is $121,992 (#1 of 52) on 595 ZCTAs. Illinois sits #5 of 52 by ZIP count at income #21.
- Texas
- ZIP-count #1 (1,935)
- New Jersey
- income #1 ($121,992)
- #5
- of 52 by ZIP count
- #21
- of 52 by avg income
ZIP-count and income are separate boards among 52 reporting states and territories. Income is the unweighted mean of each ZIP's ACS 2019–2023 median household income, so a rural code counts the same as a dense metro.
Above-median income ($80,067) across a multi-metro ZIP mosaic (1,383 codes). Home values average $191,928. Population-unweighted ZIP averages give rural codes the same vote as metros, so the state mean is a compromise: sort counties by population, then compare one urban ZIP against one rural ZIP before reading relocation or affordability stories from the headline alone.
The largest city, Chicago (2,680,484), holds a moderate share (~21%) of state ZIP population. Expect a primary metro plus a long tail of mid-size markets: the top-cities chart and county RankBars both matter, and a two-ZIP compare inside vs outside Chicago usually beats reading the state average alone.
A mid-breadth ZIP set is small enough that city pages and the top-12 ZIP RankBars cover most contrast. Use county drill-downs when two metros sit in different economic zones; otherwise jump straight from this profile to a ZIP compare.
Largest cities in Illinois
Top 10 cities by population in Illinois
Total resident population aggregated from every ZIP code the Census assigns to each city.
- Chicago
Chicago, IL
2,680,484 residents
- Aurora 206,095
Aurora, IL
206,095 residents
- Rockford 189,162
Rockford, IL
189,162 residents
- Naperville 160,668
Naperville, IL
160,668 residents
- Springfield 141,894
Springfield, IL
141,894 residents
- Peoria 136,042
Peoria, IL
136,042 residents
- Joliet 128,354
Joliet, IL
128,354 residents
- Elgin 117,295
Elgin, IL
117,295 residents
- Waukegan 98,692
Waukegan, IL
98,692 residents
- Belleville 95,666
Belleville, IL
95,666 residents
What this shows Chicago leads, but several peers sit close enough that this top-10 chart is a shortlist, not a single-city story – compare two of those metros before trusting the state mean.
Counties in Illinois
Which cities have the most ZIPs in Illinois?
Side-by-side: Compare 60629 vs 60623 →
ZIP Codes in Illinois
More IL ZIP codes
Official Data Resources for Illinois
Above-median income states still hide metro splits. Use Census ACS for income, and HUD Fair Market Rents when rent vs the state mean is the question in Illinois.
Frequently Asked Questions
How should I navigate Illinois's mid-breadth ZIP map?
With 1,383 ZIPs across 102 counties (population 12,830,581), city pages plus the top ZIP RankBars cover most contrast. Jump to a two-ZIP compare when two metros sit in different labor markets rather than scrolling the full list.
Does Illinois's above-median ZIP income mean every market is expensive?
No. The unweighted ZIP mean ($80,067) still mixes dense suburbs with thinner edges, and home values average $191,928. Open the densest metro and one thin-edge county before reading affordability from the state line alone.
Which Illinois cities should I open first?
Start with Chicago (2,680,484, ~21% of ZIP population), then one mid-size market from the largest-cities chart. A two-ZIP compare inside vs outside Chicago usually beats reading the state average alone. Other large markets include Aurora, Rockford, Naperville.
Take this with you
What to do with Illinois's numbers, next.
- See how Illinois compares to a neighboring state on the same Census fields Compare states
- Check where Illinois's ZIP codes rank nationally on income, education, or homeownership View national rankings
- Save a ZIP code to your shortlist to track alongside others you're considering View your shortlist
Figures describe 2019–2023 ACS 5-Year Estimates aggregated from ZIP Code Tabulation Areas (ZCTAs), Census Bureau approximations of USPS ZIP codes, not any single address.
Source: U.S. Census Bureau, American Community Survey (ACS) 5-Year Estimates (2019–2023); USPS ZIP Code Tabulation Areas via the HUD USPS Crosswalk.
Read our methodology to see how this data is sourced, computed, and verified.