Williamson County growth
141 new homes permitted in 2025
Census Building Permits Survey, 2025
New homes permitted in Williamson County
Housing units the county's permit offices authorized, by year, from the Census Bureau.
| Period | New homes | In single-family homes |
|---|---|---|
| Jan–Sep 2026 | 107 | 58 |
| Jan–Sep 2025 | 94 | 47 |
| 2025 | 141 | 68 |
| 2024 | 138 | 80 |
| 2023 | 129 | 66 |
| 2022 | 146 | 63 |
| 2021 | 93 | 81 |
| 2020 | 178 | 173 |
| 2019 | 178 | 168 |
New homes permitted each month, Oct 2025 to Sep 2026
People in Williamson County
- Population67,225Census Population Estimates · July 1, 2025
- Change since 2020+98 (+0.1%)July 1, 2020 to July 1, 2025 · Census Population Estimates
- New homes per 1,000 residents2.12025 permits per 1,000 people on July 1, 2025 · Census
- Median household income$65,6042020-2024 · Census ACS 5-year, ±$3,466
Jobs in Williamson County
- Jobs in the county29,573Annual average 2025, all industries, by place of work · BLS QCEW
- Change since 2020+3,203 (+12.1%)2020 to 2025 annual averages · BLS QCEW
- Average weekly wage$1,0622025, all industries · BLS QCEW
Home values in Williamson County
Change in the price of homes sold or refinanced more than once (the FHFA repeat-sales index).
- Home prices, 1 year+5%2024 to 2025 · FHFA House Price Index
- Home prices, 5 years+46%2020 to 2025 · FHFA House Price Index
Land in Williamson County
Our own figures from the county roll and the county's recorded sales.
| Quarter | Land sales | Median an acre, 1 acre or more | Median lot, under 1 acre |
|---|---|---|---|
| Q3 2026 | 18 | Too few sales | $14,000 |
| Q2 2026 | 20 | $5,521 | Too few sales |
| Q1 2026 | 12 | Too few sales | Too few sales |
| Q4 2025 | 23 | $6,942 | Too few sales |
Growth in nearby counties
More
Illinois growth by countyThe data (CSV, JSON)Williamson County overview
About these numbersSources, dates and how these figures are built
New homes
U.S. Census Bureau, Building Permits Survey, 2019-01 to 2026-09; annual files 2019-2025, posted May 14, 2026; the monthly files through Sep 2026, posted Oct 27, 2026. New housing units authorized by building permits, reported plus imputed. A month is the figure in that month's file; a year is the annual file, which adds late and corrected reports, so twelve months need not add up to the year. Public domain.
People
U.S. Census Bureau, Population Estimates Program, Vintage 2025, July 1, 2020 to July 1, 2025, posted Mar 26, 2026. Public domain.
Income
U.S. Census Bureau, American Community Survey 2020-2024 5-year, table B19013, 2020-2024 (2024 dollars), posted Jan 29, 2026. Median household income; printed at a coefficient of variation of 30% or less. Public domain.
Jobs
U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages, 2020-2025 annual averages, posted Aug 21, 2026. All industries, all ownerships, jobs covered by unemployment insurance; place of work. Public domain.
Home values
FHFA House Price Index (all-transactions), annual county and five-digit ZIP indexes, 2025, posted Mar 31, 2026. Public domain.
Land
Groundwork's map of the county roll and the county's own recorded sales: the same figures, gates and dates as the county page.
Data edition
Figures as of Oct 27, 2026. Area figures, not any one parcel's.