Adams County vs Williamson County

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

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

Williamson County has the higher population (66,902 vs 65,166 in Adams County). Williamson County has the higher median household income ($65,521 vs $64,962 in Adams County). Adams County has the higher median home value ($155,900 vs $145,600 in Williamson County).

Population, income & housing

	Adams County	Williamson County
Population	65,166	66,902
Median age	41.1 yrs	41.4 yrs
Median household income	$64,962	$65,521
Median home value	$155,900	$145,600
Median gross rent	$826	$897
Housing units	30,283	31,957
Homeownership rate	72.5%	71.1%
Bachelor's degree or higher	27.0%	27.5%
Unemployment rate	3.6%	4.3%

Trends (ACS 5-year, 2019–2023)

	Adams County	Williamson County
Population	66,085 → 65,166 (-1.4%)	67,102 → 66,902 (-0.3%)
Median household income	$52,993 → $64,962 (+22.6%)	$50,734 → $65,521 (+29.1%)
Median home value	$127,800 → $155,900 (+22.0%)	$114,900 → $145,600 (+26.7%)
Median gross rent	$713 → $826 (+15.8%)	$735 → $897 (+22.0%)

Adams County

Population

66,08565,166

Median household income

$52,993$64,962

Median home value

$127,800$155,900

Median gross rent

$713$826

Williamson County

Population

67,10266,902

Median household income

$50,734$65,521

Median home value

$114,900$145,600

Median gross rent

$735$897

Age & race/ethnicity

Age distribution (share)

	Adams County	Williamson County
Under 5	6.0%	5.4%
5 to 17	16.7%	16.1%
18 to 24	8.0%	6.7%
25 to 34	11.9%	12.7%
35 to 44	12.0%	13.5%
45 to 54	11.4%	12.4%
55 to 64	14.0%	13.6%
65 to 74	11.1%	11.5%
75 and over	9.0%	8.1%

Race & ethnicity (share)

	Adams County	Williamson County
White (non-Hispanic)	90.3%	88.2%
Black or African American	3.5%	3.5%
American Indian & Alaska Native	0.0%	0.3%
Asian	0.7%	1.5%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.2%	0.1%
Two or more races	3.2%	3.6%
Hispanic or Latino	2.0%	2.8%

Educational attainment (age 25+)

Share of adults 25+

	Adams County	Williamson County
No high school diploma	6.5%	7.6%
High school graduate	34.9%	28.1%
Some college or associate's	31.6%	36.9%
Bachelor's degree	18.1%	16.5%
Graduate or professional degree	8.9%	11.0%

Commute to work

How workers get to work (share)

	Adams County	Williamson County
Drove alone	80.5%	81.5%
Carpooled	8.3%	7.6%
Public transit	0.5%	0.3%
Walked	2.5%	0.8%
Bicycle	0.4%	0.2%
Worked from home	6.7%	8.6%
Other means	1.0%	0.9%

Housing

Units in structure (share)

	Adams County	Williamson County
1-unit, detached	75.7%	73.9%
1-unit, attached	3.7%	1.3%
2 to 4 units	7.1%	12.2%
5 to 19 units	5.3%	3.3%
20 or more units	3.7%	1.9%
Mobile home & other	4.5%	7.4%

Poverty & households

	Adams County	Williamson County
Poverty rate	12.3%	14.3%
Average household size	2.29	2.25
Mean commute (minutes)	17	23
Median year structure built	1964	1981