Knox County vs Williamson County

A side-by-side comparison of Knox County and Williamson County: population, income, housing, and more.

Knox County and Williamson County are counties in Tennessee. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Knox County has the higher population (487,401 vs 254,609 in Williamson County). Williamson County has the higher median household income ($131,202 vs $71,662 in Knox County). Williamson County has the higher median home value ($673,700 vs $279,700 in Knox County).

Population, income & housing

	Knox County	Williamson County
Population	487,401	254,609
Median age	37.3 yrs	40.3 yrs
Median household income	$71,662	$131,202
Median home value	$279,700	$673,700
Median gross rent	$1,180	$1,895
Housing units	214,606	94,418
Homeownership rate	64.9%	79.8%
Bachelor's degree or higher	40.2%	61.8%
Unemployment rate	3.6%	2.0%

Trends (ACS 5-year, 2019–2023)

	Knox County	Williamson County
Population	461,104 → 487,401 (+5.7%)	225,389 → 254,609 (+13.0%)
Median household income	$57,470 → $71,662 (+24.7%)	$112,962 → $131,202 (+16.1%)
Median home value	$183,200 → $279,700 (+52.7%)	$449,000 → $673,700 (+50.0%)
Median gross rent	$892 → $1,180 (+32.3%)	$1,500 → $1,895 (+26.3%)

Knox County

Population

461,104487,401

Median household income

$57,470$71,662

Median home value

$183,200$279,700

Median gross rent

$892$1,180

Williamson County

Population

225,389254,609

Median household income

$112,962$131,202

Median home value

$449,000$673,700

Median gross rent

$1,500$1,895

Age & race/ethnicity

Age distribution (share)

	Knox County	Williamson County
Under 5	5.5%	5.4%
5 to 17	15.5%	20.8%
18 to 24	11.9%	7.9%
25 to 34	13.8%	8.9%
35 to 44	12.8%	14.7%
45 to 54	12.1%	15.1%
55 to 64	12.2%	12.8%
65 to 74	9.7%	8.9%
75 and over	6.4%	5.4%

Race & ethnicity (share)

	Knox County	Williamson County
White (non-Hispanic)	79.6%	81.5%
Black or African American	8.0%	3.8%
American Indian & Alaska Native	0.1%	0.0%
Asian	2.2%	5.2%
Native Hawaiian & Pacific Islander	0.1%	0.0%
Some other race	0.5%	0.5%
Two or more races	3.5%	3.2%
Hispanic or Latino	6.1%	5.8%

Educational attainment (age 25+)

Share of adults 25+

	Knox County	Williamson County
No high school diploma	7.7%	4.1%
High school graduate	24.6%	13.2%
Some college or associate's	27.5%	20.9%
Bachelor's degree	24.4%	38.3%
Graduate or professional degree	15.7%	23.5%

Commute to work

How workers get to work (share)

	Knox County	Williamson County
Drove alone	76.8%	66.9%
Carpooled	7.2%	5.3%
Public transit	0.6%	0.1%
Walked	1.7%	0.7%
Bicycle	0.1%	0.0%
Worked from home	12.7%	25.8%
Other means	0.8%	1.1%

Housing

Units in structure (share)

	Knox County	Williamson County
1-unit, detached	65.9%	78.1%
1-unit, attached	5.4%	5.3%
2 to 4 units	5.2%	2.3%
5 to 19 units	11.7%	5.4%
20 or more units	7.9%	7.2%
Mobile home & other	3.8%	1.7%

Poverty & households

	Knox County	Williamson County
Poverty rate	12.2%	4.5%
Average household size	2.41	2.80
Mean commute (minutes)	22	28
Median year structure built	1985	2001