Market insights · Iowa
Plymouth County, IA: growth, migration and housing
Plymouth County has 25,697 residents, up 0.0% since 2020 (+0.1% in the last year). In 2022–2023, 576 households moved in and 676 moved out (-100 net), while a net $11.5M of income left. Median household income is $83,251, the median home $228,900 and median rent $910 a month.
In Iowa: 35th of 99 counties for 5-year population growth · 75th of 99 counties for net in-migration (per resident) · 11th of 99 counties for median household income · 14th of 99 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Plymouth County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Woodbury County, IA | 178 | $10.7M |
| Sioux County, IA | 46 | $2.4M |
| Cherokee County, IA | 23 | $1.3M |
Where leavers went
Top counties by households leaving Plymouth County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Woodbury County, IA | 168 | $8.9M |
| Sioux County, IA | 45 | $2.1M |
| Polk County, IA | 25 | $1.7M |
| Minnehaha County, SD | 25 | $1.4M |
| Cherokee County, IA | 24 | $1.4M |
BizyFi in Plymouth 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.