Market insights · Illinois
Cook County, IL: growth, migration and housing
Cook County has 5,194,625 residents, down 1.3% since 2020 (+0.1% in the last year). In 2022–2023, 85,178 households moved in and 98,626 moved out (-13,448 net), while a net $4.35B of income left. Median household income is $83,498, the median home $324,500 and median rent $1,435 a month.
In Illinois: 35th of 102 counties for 5-year population growth · 68th of 102 counties for net in-migration (per resident) · 14th of 102 counties for median household income · 4th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Cook County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| DuPage County, IL | 8,374 | $716.7M |
| Lake County, IL | 4,959 | $620.8M |
| Will County, IL | 4,824 | $311.1M |
| Kane County, IL | 2,754 | $178.7M |
| Lake County, IN | 2,665 | $117.2M |
| Los Angeles County, CA | 1,570 | $150.4M |
| McHenry County, IL | 1,307 | $89.1M |
| Maricopa County, AZ | 1,160 | $88.3M |
Where leavers went
Top counties by households leaving Cook County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| DuPage County, IL | 11,143 | $1237.6M |
| Will County, IL | 6,972 | $633.1M |
| Lake County, IL | 6,447 | $1227.1M |
| Lake County, IN | 4,226 | $239.8M |
| Kane County, IL | 3,820 | $299.0M |
| McHenry County, IL | 2,305 | $184.0M |
| Los Angeles County, CA | 1,982 | $226.6M |
| New York County, NY | 1,755 | $299.4M |
BizyFi in Cook County
68 companies in the BizyFi directory are based here. Search them on the company map (company names with a free account), or browse Illinois companies.
← All Illinois counties · National rankings
Sources: U.S. Census Bureau population estimates (vintage 2025), American Community Survey 5-year (2024), and IRS Statistics of Income county-to-county migration data (2022–2023). Migration counts are tax returns (roughly households) moving between U.S. counties; the IRS suppresses very small flows. Growth rates, per-1,000 figures, rent share and state ranks are BizyFi calculations. Data updated 2026-10-17. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.