Population 66,876 · Census ACS 2020–24
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Population and households in Williamson County
Household size in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 2.45 | 2.69 | 2.68 |
| 2010–14 | 2.45 | 2.71 | 2.73 |
| 2015–19 | 2.42 | 2.66 | 2.71 |
| 2020–24 | 2.30 | 2.58 | 2.65 |
| Change | −0.15 | −0.11 | −0.03 |
Williamson County is a place of small households, averaging 2.30 people against 2.65 for the U.S., which points to many singles, couples and roommates and relatively few children. Household size has dropped from 2.45 in 2006–10, a much bigger shift than nationally. Households are largest in the northeast and smallest in the center.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 40.7 | 37.6 | 37.7 |
| 2010–14 | 41.1 | 38.5 | 38.6 |
| 2015–19 | 42.0 | 39.6 | 39.6 |
| 2020–24 | 42.9 | 40.2 | 40.1 |
| Change | +2.2 | +2.6 | +2.3 |
The median resident of Williamson County is 42.9 years old, older than the national median of 40.1. Since 2006–10, the median age has climbed from 40.7, in line with the national trend.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 10.6% | 11.7% | 12.3% |
| 2010–14 | 10.9% | 11.7% | 12.3% |
| 2015–19 | 10.8% | 11.1% | 11.6% |
| 2020–24 | 12.6% | 11.3% | 11.6% |
| Change | +2.0 pts | −0.4 pts | −0.6 pts |
Single parents head about one in eight households in Williamson County (12.6%), close to the national share of 11.6%. Single parents are more common here than in Illinois as a whole (11.3%). Since 2006–10, the single-parent share has risen 2.0 points, even as the national share fell.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Williamson County
Renters in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 26.4% | 30.8% | 33.3% |
| 2010–14 | 27.8% | 33.1% | 35.6% |
| 2015–19 | 29.9% | 33.9% | 36.0% |
| 2020–24 | 29.3% | 32.9% | 34.8% |
| Change | +2.9 pts | +2.1 pts | +1.5 pts |
About three in ten households in Williamson County rent their homes (29.3%), a little below the national share of 34.8%; the rest own. Among homeowners, 43.3% have no mortgage at all, above the national share of 39.8%. Renting is most common in the west and least common in the southeast. The renter share is up 2.9 points from 2006–10, mirroring the country.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 12.8% | 10.0% | 11.4% |
| 2010–14 | 13.1% | 10.1% | 11.4% |
| 2015–19 | 13.5% | 9.8% | 11.1% |
| 2020–24 | 10.0% | 8.1% | 9.6% |
| Change | −2.8 pts | −1.9 pts | −1.8 pts |
About as many homes sit empty in Williamson County as nationally: 10.0%, against 9.6%. The rate is higher than in Illinois overall (8.1%). Vacancy has fallen 2.8 points since 2006–10, as it has nationally.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 1973 | 1966 | 1974 |
| 2010–14 | 1974 | 1967 | 1975 |
| 2015–19 | 1980 | 1968 | 1977 |
| 2020–24 | 1982 | 1970 | 1980 |
| Change | +9 | +4 | +6 |
Homes in Williamson County are about the same age as the nation's housing: the median home was built in 1982, versus 1980 nationally. Homes here are newer than in Illinois overall, where the median home dates to 1970. The newest homes are mostly in the west, the oldest in the north. Of Illinois' 102 counties, only seven have newer homes.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | $635 | $953 | $965 |
| 2010–14 | $662 | $1,028 | $1,040 |
| 2015–19 | $754 | $1,165 | $1,213 |
| 2020–24 | $922 | $1,428 | $1,571 |
| Change | +$287 | +$475 | +$606 |
A typical rental in Williamson County costs $922 a month with utilities, well below the national median of $1,571. Rent has climbed $287 a month since 2006–10, up 45%, a slower climb than the nation's. The typical renter here spends 29.4% of household income on rent, just under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally. Renters on a budget will find the lowest rents in the northwest; the highest are in the northeast.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Williamson County
Bachelor's degrees in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 22.1% | 31.2% | 28.4% |
| 2010–14 | 22.5% | 32.4% | 29.6% |
| 2015–19 | 24.8% | 34.7% | 32.1% |
| 2020–24 | 26.5% | 37.7% | 35.6% |
| Change | +4.4 pts | +6.5 pts | +7.2 pts |
Just over a quarter of adults 25 and older in Williamson County (26.5%) have a bachelor's degree or higher, below the national share of 35.6%. The share with a degree has risen 4.4 points since 2006–10, as it has nationally. College graduates are most concentrated in the west and least in the northeast.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 88.2% | 86.3% | 84.9% |
| 2010–14 | 88.8% | 87.5% | 86.1% |
| 2015–19 | 92.3% | 89.1% | 87.7% |
| 2020–24 | 93.0% | 90.3% | 89.3% |
| Change | +4.9 pts | +4.0 pts | +4.3 pts |
High school completion in Williamson County is above the national rate: 93.0% of adults have a diploma or equivalent, against 89.3%. Since 2006–10, the share with a diploma has risen 4.9 points, in line with the national trend.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Williamson County
| Period | Williamson County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 9.5% | 8.7% | 8.1% |
| 2010–14 | 7.6% | 10.2% | 9.4% |
| 2015–19 | 5.7% | 6.1% | 5.6% |
| 2020–24 | 5.3% | 6.0% | 5.4% |
| Change | −4.1 pts | −2.7 pts | −2.7 pts |
At 5.3%, unemployment in Williamson County is close to the national rate of 5.4%. Unemployment has fallen 4.1 points since 2006–10, mirroring the country. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Williamson County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Williamson County | 2.30 | 42.9 | 12.6% | 29.3% | 10.0% | 1982 | $922 | 26.5% | 93.0% | 5.3% |
| Jackson County | 2.20 | 38.6 | 10.5% | 50.0% | 16.0% | 1976 | $815 | 37.0% | 92.8% | 6.8% |
| Saline County | 2.30 | 45.3 | 13.0% | 27.5% | 13.4% | 1971 | $842 | 21.2% | 90.1% | 6.8% |
| Gallatin County | 2.36 | 46.8 | 13.4% | 22.6% | 14.8% | 1966 | $663 | 13.7% | 87.0% | 8.0% |
| Perry County | 2.51 | 42.0 | 9.0% | 23.5% | 10.2% | 1977 | $913 | 20.6% | 86.5% | 4.9% |
| Union County | 2.41 | 44.2 | 9.0% | 29.8% | 11.6% | 1975 | $760 | 13.2% | 91.2% | 2.8% |
| Henderson County | 2.42 | 42.1 | 13.0% | 35.1% | 10.2% | 1975 | $829 | 20.2% | 89.5% | 2.6% |
| St. Francois County | 2.51 | 39.6 | 12.3% | 31.8% | 13.2% | 1981 | $788 | 17.7% | 87.3% | 4.2% |
| Daviess County | 2.49 | 39.1 | 13.1% | 31.9% | 8.0% | 1978 | $937 | 26.0% | 91.7% | 4.9% |
| Hancock County | 2.52 | 41.4 | 14.5% | 22.8% | 6.9% | 1983 | $737 | 17.3% | 87.5% | 4.8% |
| Breckinridge County | 2.64 | 42.0 | 10.2% | 18.6% | 21.4% | 1988 | $751 | 13.7% | 85.5% | 4.4% |
All figures 2020–24.
Counties with similar populations: Valencia County, NM · White County, AR · Pulaski County, KY · Otero County, NM · Otsego County, NY · Oxford County, ME · Pender County, NC · Pickaway County, OH · Pike County, KY · Pike County, PA
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Williamson County. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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