Market insights · Wisconsin
Rock County, WI: growth, migration and housing
Rock County has 166,472 residents, up 1.6% since 2020 (+0.5% in the last year). In 2022–2023, 3,589 households moved in and 3,504 moved out (+85 net), while a net $3.1M of income left. Median household income is $75,673, the median home $231,600 and median rent $1,037 a month.
In Wisconsin: 30th of 72 counties for 5-year population growth · 32nd of 72 counties for net in-migration (per resident) · 25th of 72 counties for median household income · 31st of 72 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Rock County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Dane County, WI | 776 | $49.7M |
| Winnebago County, IL | 424 | $21.2M |
| Walworth County, WI | 243 | $12.8M |
| Jefferson County, WI | 194 | $10.6M |
| Green County, WI | 126 | $6.0M |
| Milwaukee County, WI | 99 | $5.1M |
| Cook County, IL | 93 | $7.2M |
| Waukesha County, WI | 55 | $3.4M |
Where leavers went
Top counties by households leaving Rock County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Dane County, WI | 620 | $33.6M |
| Winnebago County, IL | 400 | $19.4M |
| Walworth County, WI | 215 | $10.0M |
| Jefferson County, WI | 133 | $8.1M |
| Milwaukee County, WI | 132 | $5.8M |
| Green County, WI | 120 | $6.6M |
| Waukesha County, WI | 94 | $6.0M |
| Cook County, IL | 75 | $3.7M |
BizyFi in Rock 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 Wisconsin companies.
← All Wisconsin 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.