Population 260,351 · Census ACS 2020–24
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Population and households in Williamson County
Household size in Williamson County
| Period | Williamson County | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.84 | 2.57 | 2.53 | 2.68 |
| 2010–14 | 2.92 | 2.63 | 2.57 | 2.73 |
| 2015–19 | 2.96 | 2.64 | 2.57 | 2.71 |
| 2020–24 | 2.91 | 2.56 | 2.53 | 2.65 |
| Change | +0.07 | −0.01 | +0.00 | −0.03 |
Households in Williamson County are large by national standards, averaging 2.91 people against 2.65 for the U.S. That usually means more families with children at home. Since 2006–10, household size has crept up from 2.84, even as the national average fell. Williamson County has the largest households of any Tennessee county.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 38.6 | 36.6 | 38.3 | 37.7 |
| 2010–14 | 39.0 | 37.3 | 39.2 | 38.6 |
| 2015–19 | 39.6 | 37.9 | 39.9 | 39.6 |
| 2020–24 | 40.9 | 38.0 | 39.9 | 40.1 |
| Change | +2.2 | +1.5 | +1.6 | +2.3 |
At 40.9, the median age in Williamson County is close to the national median of 40.1, so its age mix looks much like the country's. The population here is older than in the Nashville area as a whole, where the median age is 38.0. Since 2006–10, the median age has climbed from 38.6, as it has nationally.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 7.2% | 11.7% | 12.2% | 12.3% |
| 2010–14 | 7.3% | 11.6% | 12.0% | 12.3% |
| 2015–19 | 6.6% | 10.7% | 11.6% | 11.6% |
| 2020–24 | 6.2% | 10.7% | 11.8% | 11.6% |
| Change | −1.0 pts | −1.0 pts | −0.4 pts | −0.6 pts |
Single-parent households are relatively rare in Williamson County: 6.2% of households, against 11.6% nationally. The single-parent share has edged down 1.0 points since 2006–10, in line with the national trend. Of Tennessee's 95 counties, only three have a lower share of single-parent households.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 17.1% | 31.5% | 30.4% | 33.3% |
| 2010–14 | 19.0% | 34.2% | 32.9% | 35.6% |
| 2015–19 | 19.4% | 34.2% | 33.7% | 36.0% |
| 2020–24 | 21.2% | 34.8% | 33.1% | 34.8% |
| Change | +4.1 pts | +3.3 pts | +2.6 pts | +1.5 pts |
Only 21.2% of households in Williamson County rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Just over three in ten owners (31.1%) have paid off their mortgages, below the national share of 39.8%. Renting is most common in the center and least common in the southeast. The renter share is up 4.1 points from 2006–10, in line with the national trend.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.0% | 9.1% | 11.5% | 11.4% |
| 2010–14 | 4.5% | 8.8% | 11.8% | 11.4% |
| 2015–19 | 5.5% | 8.5% | 11.8% | 11.1% |
| 2020–24 | 5.4% | 8.2% | 10.1% | 9.6% |
| Change | −0.6 pts | −0.9 pts | −1.4 pts | −1.8 pts |
Only 5.4% of homes in Williamson County are vacant, far below the national rate of 9.6%, which usually means strong demand for housing. Since 2006–10, vacancy has edged down 0.6 points, a smaller shift than nationally. Williamson County has the lowest vacancy rate of any Tennessee county.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 1992 | 1984 | 1981 | 1974 |
| 2010–14 | 1994 | 1985 | 1982 | 1975 |
| 2015–19 | 1997 | 1988 | 1983 | 1977 |
| 2020–24 | 2001 | 1992 | 1986 | 1980 |
| Change | +9 | +9 | +6 | +6 |
Williamson County has newer housing than the country as a whole: the median home was built in 2001, versus 1980 nationally. The median year built has moved up from 1992 in 2006–10, a sign of steady new building. The newest homes are mostly in the east, the oldest in the northwest. Williamson County has the newest homes of any Tennessee county.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,313 | $905 | $761 | $965 |
| 2010–14 | $1,390 | $986 | $837 | $1,040 |
| 2015–19 | $1,809 | $1,212 | $961 | $1,213 |
| 2020–24 | $2,202 | $1,653 | $1,286 | $1,571 |
| Change | +$889 | +$749 | +$526 | +$606 |
A typical rental in Williamson County costs $2,202 a month with utilities, well above the national median of $1,571. Rent has climbed $889 a month since 2006–10, up 68%, faster than rents rose nationally. The typical renter here spends 29.1% of household income on rent, just under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally. No other Tennessee county has higher rents.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 51.0% | 30.1% | 23.9% | 28.4% |
| 2010–14 | 54.0% | 32.0% | 25.3% | 29.6% |
| 2015–19 | 60.4% | 36.3% | 27.9% | 32.1% |
| 2020–24 | 63.1% | 41.0% | 31.4% | 35.6% |
| Change | +12.1 pts | +10.9 pts | +7.5 pts | +7.2 pts |
College graduates are unusually common in Williamson County: 63.1% of adults 25 and older have a bachelor's degree or higher, against 35.6% nationally. Education tends to track local incomes and the kinds of jobs nearby. The share with a degree has risen 12.1 points since 2006–10, mirroring the country. No other Tennessee county has a higher share of college graduates.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 95.1% | 86.5% | 83.3% | 84.9% |
| 2010–14 | 95.2% | 88.0% | 85.4% | 86.1% |
| 2015–19 | 95.5% | 90.0% | 87.6% | 87.7% |
| 2020–24 | 96.3% | 91.7% | 89.9% | 89.3% |
| Change | +1.3 pts | +5.1 pts | +6.6 pts | +4.3 pts |
High school completion is high in Williamson County: 96.3% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. The share with a diploma is up 1.3 points from 2006–10, a smaller shift than nationally. Williamson County has the highest share of high school graduates of any Tennessee county.
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 | Nashville area | Tennessee | U.S. |
|---|---|---|---|---|
| 2006–10 | 4.5% | 7.2% | 8.6% | 8.1% |
| 2010–14 | 4.8% | 7.8% | 9.6% | 9.4% |
| 2015–19 | 2.7% | 3.9% | 5.4% | 5.6% |
| 2020–24 | 2.5% | 3.6% | 4.8% | 5.4% |
| Change | −2.1 pts | −3.6 pts | −3.8 pts | −2.7 pts |
The job market in Williamson County has been strong: just 2.5% of the labor force was out of work and looking, well below the national rate of 5.4%. Few Tennessee counties have lower unemployment: only five of 95. Unemployment has fallen 2.1 points since 2006–10, as it has nationally.
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 | 2.91 | 40.9 | 6.2% | 21.2% | 5.4% | 2001 | $2,202 | 63.1% | 96.3% | 2.5% |
| Rutherford County | 2.83 | 34.8 | 12.4% | 35.2% | 7.7% | 1999 | $1,658 | 36.2% | 92.7% | 3.5% |
| Hickman County | 2.54 | 42.6 | 13.5% | 20.8% | 11.9% | 1988 | $955 | 13.9% | 86.1% | 2.8% |
| Humphreys County | 2.72 | 43.9 | 10.6% | 21.7% | 20.1% | 1982 | $892 | 16.3% | 87.7% | 6.1% |
| DeKalb County | 2.44 | 41.7 | 9.8% | 27.4% | 12.6% | 1987 | $893 | 20.7% | 84.1% | 5.9% |
| Benton County | 2.27 | 46.4 | 8.7% | 24.9% | 15.0% | 1980 | $794 | 12.5% | 88.6% | 5.8% |
| White County | 2.51 | 43.3 | 9.5% | 23.1% | 9.1% | 1983 | $831 | 14.8% | 84.4% | 6.1% |
| Carroll County | 2.40 | 40.6 | 10.7% | 25.5% | 11.9% | 1978 | $776 | 19.1% | 89.5% | 4.4% |
| Cumberland County | 2.26 | 51.4 | 7.9% | 19.8% | 10.6% | 1993 | $965 | 18.3% | 90.7% | 4.9% |
| Gibson County | 2.52 | 39.8 | 13.4% | 31.2% | 10.7% | 1978 | $954 | 20.7% | 88.8% | 5.9% |
| Morgan County | 2.72 | 41.9 | 10.7% | 15.1% | 16.6% | 1985 | $847 | 13.7% | 85.5% | 5.5% |
All figures 2020–24.
Counties with similar populations: Sussex County, DE · Buncombe County, NC · Weber County, UT · Cass County, ND · Champaign County, IL · Charlotte County, FL · Chatham County, GA · Chesapeake City, VA · Trumbull County, OH · Clay County, FL
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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