Market insights · Illinois
Grundy County, IL: growth, migration and housing
Grundy County has 54,052 residents, up 2.9% since 2020 (+0.6% in the last year). In 2022–2023, 1,580 households moved in and 1,581 moved out (-1 net), while a net $4.6M of income left. Median household income is $92,235, the median home $271,700 and median rent $1,177 a month.
In Illinois: 2nd of 102 counties for 5-year population growth · 18th of 102 counties for net in-migration (per resident) · 10th of 102 counties for median household income · 9th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Grundy County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Will County, IL | 710 | $46.5M |
| Cook County, IL | 150 | $11.7M |
| LaSalle County, IL | 95 | $7.8M |
| Kendall County, IL | 86 | $7.3M |
| DuPage County, IL | 68 | $3.8M |
| Livingston County, IL | 60 | $2.8M |
| Kankakee County, IL | 39 | $1.6M |
| Kane County, IL | 28 | $1.4M |
Where leavers went
Top counties by households leaving Grundy County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Will County, IL | 502 | $32.9M |
| LaSalle County, IL | 138 | $7.7M |
| Cook County, IL | 124 | $6.7M |
| Livingston County, IL | 73 | $4.5M |
| Kendall County, IL | 62 | $4.2M |
| DuPage County, IL | 50 | $4.3M |
| Kankakee County, IL | 42 | $2.1M |
BizyFi in Grundy County
Fewer than 3 companies in the BizyFi directory are based here. Search them on the company map (company names with a free account), or browse Illinois companies.
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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.