County demographics · Illinois
Cook County, Illinois demographics
Cook County, Illinois (county FIPS 17031) has a median household income of $83,498 (±$630) and a total population of 5,182,090 in the American Community Survey 5-year estimates for 2020-2024.
Margins of error are at the 90% confidence level. The figures describe 2020-2024 (dollars in 2024 dollars), not the present. 178 ZIP Code Tabulation Areas overlap the county (Census 2020).
Data as of Oct 22, 2026 (Olympus publication) · Markdown version
- Values are ACS 5-year estimates for 2020-2024 (dollars in 2024 dollars), not current figures.
- ZCTA-county overlaps come from the Census 2020 relationship file and use 2020 counties, by land area; Connecticut uses its legacy counties, not the planning regions in ACS 2022+.
ACS 5-year estimates, 2020-2024
Census American Community Survey 5-year estimates for 2020-2024, with 90% margins of error as published by the Census Bureau.
| Metric | Estimate | Margin of error (90%) | ACS table |
|---|---|---|---|
| Total population | 5,182,090 | none (controlled estimate) | B01003 |
| Median age | 38 years | ±0.1 years | B01002 |
| Households | 2,100,230 | ±3,848 | B11001 |
| Median household income (inflation-adjusted to the final ACS year) | $83,498 | ±$630 | B19013 |
| Median value of owner-occupied housing units | $324,500 | ±$1,460 | B25077 |
| Median gross rent | $1,435 | ±$7 | B25064 |
| Owner-occupied share of occupied housing units | 57.7% | none (derived from several estimates) | B25003 (derived) |
| Renter-occupied share of occupied housing units | 42.3% | none (derived from several estimates) | B25003 (derived) |
| High school graduate or higher (age 25+) | 88.6% | none (derived from several estimates) | B15003 (derived) |
| Bachelor's degree or higher (age 25+) | 42.7% | none (derived from several estimates) | B15003 (derived) |
| Share of people below the poverty level | 13.5% | none (derived from several estimates) | B17001 (derived) |
| Unemployment rate (civilian labor force) | 7% | none (derived from several estimates) | B23025 (derived) |
- Dollar values are in 2024 inflation-adjusted dollars.
- Percentages' margins of error are in percentage points (pp).
Geography
| Measure | Value |
|---|---|
| County FIPS | 17031 |
| Land area | 944.92 sq mi |
| Water area | 689.71 sq mi |
| Population density | 5,484 per sq mi of land |
| Geography vintage | 2024 Gazetteer |
ZIP codes (ZCTAs) in this county
ZCTAs that overlap the county in the Census 2020 ZCTA to county relationship file, largest share of the county's land first.
| ZCTA | Share of county land | Share of ZCTA land | County is the ZCTA's primary county |
|---|---|---|---|
| 60010 | 4% | 50.7% | Yes |
| 60411 | 3.2% | 100% | Yes |
| 60439 | 2.1% | 67.4% | Yes |
| 60062 | 2% | 100% | Yes |
| 60007 | 1.8% | 96% | Yes |
| 60018 | 1.8% | 100% | Yes |
| 60462 | 1.7% | 100% | Yes |
| 60467 | 1.5% | 94% | Yes |
| 60477 | 1.5% | 96.3% | Yes |
| 60617 | 1.4% | 100% | Yes |
| 60464 | 1.4% | 100% | Yes |
| 60525 | 1.4% | 100% | Yes |
| 60067 | 1.4% | 100% | Yes |
| 60120 | 1.3% | 72.3% | Yes |
| 60016 | 1.3% | 100% | Yes |
| 60443 | 1.2% | 100% | Yes |
| 60480 | 1.2% | 100% | Yes |
| 60192 | 1.2% | 100% | Yes |
| 60004 | 1.2% | 100% | Yes |
| 60638 | 1.2% | 100% | Yes |
| 60628 | 1.2% | 100% | Yes |
| 60056 | 1.1% | 100% | Yes |
| 60025 | 1.1% | 100% | Yes |
| 60478 | 1% | 100% | Yes |
| 60633 | 1% | 100% | Yes |
| 60090 | 0.9% | 99.5% | Yes |
| 60193 | 0.9% | 100% | Yes |
| 60452 | 0.9% | 100% | Yes |
| 60453 | 0.9% | 100% | Yes |
| 60093 | 0.9% | 100% | Yes |
| 60438 | 0.9% | 100% | Yes |
| 60473 | 0.8% | 100% | Yes |
| 60803 | 0.8% | 100% | Yes |
| 60609 | 0.8% | 100% | Yes |
| 60409 | 0.8% | 100% | Yes |
| 60426 | 0.8% | 100% | Yes |
| 60107 | 0.8% | 100% | Yes |
| 60169 | 0.8% | 100% | Yes |
| 60632 | 0.8% | 100% | Yes |
| 60643 | 0.8% | 100% | Yes |
| 60068 | 0.8% | 100% | Yes |
| 60804 | 0.8% | 100% | Yes |
| 60634 | 0.8% | 100% | Yes |
| 60629 | 0.7% | 100% | Yes |
| 60827 | 0.7% | 100% | Yes |
| 60620 | 0.7% | 100% | Yes |
| 60430 | 0.7% | 100% | Yes |
| 60074 | 0.7% | 94.7% | Yes |
| 60005 | 0.7% | 100% | Yes |
| 60173 | 0.7% | 100% | Yes |
| 60714 | 0.7% | 100% | Yes |
| 60608 | 0.7% | 100% | Yes |
| 60103 | 0.7% | 33.8% | |
| 60619 | 0.6% | 100% | Yes |
| 60402 | 0.6% | 100% | Yes |
| 60425 | 0.6% | 100% | Yes |
| 60131 | 0.6% | 100% | Yes |
| 60623 | 0.6% | 100% | Yes |
| 60406 | 0.6% | 100% | Yes |
| 60091 | 0.6% | 100% | Yes |
| 60463 | 0.6% | 100% | Yes |
| 60076 | 0.5% | 100% | Yes |
| 60008 | 0.5% | 100% | Yes |
| 60428 | 0.5% | 100% | Yes |
| 60053 | 0.5% | 100% | Yes |
| 60618 | 0.5% | 100% | Yes |
| 60639 | 0.5% | 100% | Yes |
| 60164 | 0.5% | 100% | Yes |
| 60652 | 0.5% | 100% | Yes |
| 60630 | 0.5% | 100% | Yes |
| 60466 | 0.5% | 72.7% | Yes |
| 60160 | 0.5% | 100% | Yes |
| 60637 | 0.5% | 100% | Yes |
| 60201 | 0.5% | 100% | Yes |
| 60646 | 0.5% | 100% | Yes |
| 60487 | 0.5% | 59% | Yes |
| 60655 | 0.5% | 100% | Yes |
| 60154 | 0.5% | 100% | Yes |
| 60501 | 0.5% | 100% | Yes |
| 60465 | 0.5% | 100% | Yes |
| 60445 | 0.5% | 100% | Yes |
| 60419 | 0.4% | 100% | Yes |
| 60455 | 0.4% | 100% | Yes |
| 60077 | 0.4% | 100% | Yes |
| 60459 | 0.4% | 100% | Yes |
| 60026 | 0.4% | 100% | Yes |
| 60429 | 0.4% | 100% | Yes |
| 60641 | 0.4% | 100% | Yes |
| 60546 | 0.4% | 100% | Yes |
| 60422 | 0.4% | 100% | Yes |
| 60070 | 0.4% | 100% | Yes |
| 60647 | 0.4% | 100% | Yes |
| 60636 | 0.4% | 100% | Yes |
| 60526 | 0.4% | 100% | Yes |
| 60616 | 0.4% | 100% | Yes |
| 60022 | 0.4% | 100% | Yes |
| 60471 | 0.4% | 95.5% | Yes |
| 60625 | 0.4% | 100% | Yes |
| 60621 | 0.4% | 100% | Yes |
| 60631 | 0.4% | 100% | Yes |
| 60612 | 0.4% | 100% | Yes |
| 60194 | 0.4% | 100% | Yes |
| 60649 | 0.4% | 100% | Yes |
| 60707 | 0.4% | 100% | Yes |
| 60624 | 0.4% | 100% | Yes |
| 60644 | 0.4% | 100% | Yes |
| 60651 | 0.4% | 100% | Yes |
| 60805 | 0.4% | 100% | Yes |
| 60461 | 0.4% | 100% | Yes |
| 60476 | 0.4% | 100% | Yes |
| 60475 | 0.3% | 68.5% | Yes |
| 60656 | 0.3% | 100% | Yes |
| 60614 | 0.3% | 100% | Yes |
| 60162 | 0.3% | 100% | Yes |
| 60513 | 0.3% | 100% | Yes |
| 60457 | 0.3% | 100% | Yes |
| 60706 | 0.3% | 100% | Yes |
| 60202 | 0.3% | 100% | Yes |
| 60133 | 0.3% | 35.9% | |
| 60527 | 0.3% | 20.7% | |
| 60418 | 0.3% | 100% | Yes |
| 60302 | 0.3% | 100% | Yes |
| 60458 | 0.3% | 100% | Yes |
| 60558 | 0.3% | 100% | Yes |
| 60153 | 0.3% | 100% | Yes |
| 60130 | 0.3% | 100% | Yes |
| 60712 | 0.3% | 100% | Yes |
| 60176 | 0.3% | 100% | Yes |
| 60622 | 0.3% | 100% | Yes |
| 60305 | 0.3% | 100% | Yes |
| 60640 | 0.2% | 100% | Yes |
| 60653 | 0.2% | 100% | Yes |
| 60659 | 0.2% | 100% | Yes |
| 60482 | 0.2% | 100% | Yes |
| 60613 | 0.2% | 100% | Yes |
| 60607 | 0.2% | 100% | Yes |
| 60104 | 0.2% | 100% | Yes |
| 60415 | 0.2% | 100% | Yes |
| 60171 | 0.2% | 100% | Yes |
| 60645 | 0.2% | 100% | Yes |
| 60615 | 0.2% | 100% | Yes |
| 60657 | 0.2% | 100% | Yes |
| 60089 | 0.2% | 21.6% | |
| 60423 | 0.2% | 5.3% | |
| 60534 | 0.2% | 100% | Yes |
| 60155 | 0.2% | 100% | Yes |
| 60626 | 0.2% | 100% | Yes |
| 60472 | 0.2% | 100% | Yes |
| 60195 | 0.2% | 100% | Yes |
| 60642 | 0.2% | 100% | Yes |
| 60304 | 0.2% | 100% | Yes |
| 60605 | 0.2% | 100% | Yes |
| 60660 | 0.1% | 100% | Yes |
| 60163 | 0.1% | 100% | Yes |
| 60172 | 0.1% | 17.4% | |
| 60469 | 0.1% | 100% | Yes |
| 60610 | 0.1% | 100% | Yes |
| 60521 | 0.1% | 17.2% | |
| 60611 | 0.1% | 100% | Yes |
| 60203 | 0.1% | 100% | Yes |
| 60449 | 0.1% | 1.3% | |
| 60043 | 0.1% | 100% | Yes |
| 60654 | 0.1% | 100% | Yes |
| 60015 | 0.1% | 3.8% | |
| 60456 | 0.1% | 100% | Yes |
| 60029 | 0% | 100% | Yes |
| 60141 | 0% | 100% | Yes |
| 60601 | 0% | 100% | Yes |
| 60165 | 0% | 100% | Yes |
| 60126 | 0% | 2.7% | |
| 60661 | 0% | 100% | Yes |
| 60606 | 0% | 100% | Yes |
| 60208 | 0% | 100% | Yes |
| 60301 | 0% | 100% | Yes |
| 60603 | 0% | 100% | Yes |
| 60602 | 0% | 100% | Yes |
| 60604 | 0% | 100% | Yes |
| 60523 | 0% | 0.2% |
Sources
- American Community Survey 5-year estimates (Census Data API) — U.S. Census Bureau. ACS 5-year 2020-2024 (release acs5-2024:county), source date 2025-09-02. https://api.census.gov/data/2024/acs/acs5?get=NAME,B01003_001E,B01003_001M,B01002_001E,B01002_001M,B11001_001E,B11001_001M,B19013_001E,B19013_001M,B25077_001E,B25077_001M,B25064_001E,B25064_001M,B25003_001E,B25003_002E,B25003_003E,B15003_001E,B15003_017E,B15003_018E,B15003_019E,B15003_020E,B15003_021E,B15003_022E,B15003_023E,B15003_024E,B15003_025E,B17001_001E,B17001_002E,B23025_003E,B23025_005E&for=county:031&in=state:17
- Published by Olympus on Oct 22, 2026.
- Source data: U.S. Census Bureau. Works of the U.S. government are not subject to copyright in the United States.
- This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
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The same figures, with provenance on every value, from the API (free API key, reference) or from an AI agent through the Olympus MCP server.
curl -s "https://api.olympus.new-odyssey.com/v1/geo-demographics/counties/17031" -H "X-API-Key: $OLYMPUS_API_KEY"get_us_demographics {"county_fips":"17031"}