Market insights · Iowa
Grundy County, IA: growth, migration and housing
Grundy County has 12,361 residents, up 0.2% since 2020 (-0.1% in the last year). In 2022–2023, 285 households moved in and 324 moved out (-39 net), while a net $0.4M of income left. Median household income is $87,205, the median home $198,800 and median rent $774 a month.
In Iowa: 32nd of 99 counties for 5-year population growth · 68th of 99 counties for net in-migration (per resident) · 5th of 99 counties for median household income · 23rd of 99 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) |
|---|---|---|
| Black Hawk County, IA | 91 | $6.1M |
| Marshall County, IA | 29 | $2.2M |
| Hardin County, IA | 25 | $1.4M |
| Tama County, IA | 21 | $1.0M |
| Butler County, IA | 20 | $1.4M |
Where leavers went
Top counties by households leaving Grundy County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Black Hawk County, IA | 113 | $6.3M |
| Marshall County, IA | 24 | $1.2M |
BizyFi in Grundy County
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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.