Thayer

County:: Sangamon County
County Seat:: No
Area (mi²):: 0.61
State:: Illinois

Thayer is a village located in Sangamon County, Illinois. Thayer has a 2025 population of 604. Thayer is currently declining at a rate of -0.82% annually and its population has decreased by -4.28% since the most recent census, which recorded a population of 631 in 2020.

The average household income in Thayer is $77,931 with a poverty rate of 9.38%. The median age in Thayer is 43.6 years: 46.3 years for males, and 42.6 years for females.

Demographics

The racial composition of Thayer includes 94.04% White, and smaller percentages for Two or more races, Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Asian

Black or African American

Native American

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	600	94.04%
Two or more races	17	2.66%
Asian	11	1.72%
Black or African American	10	1.57%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

Thayer Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Thayer's average per capita income is $42,667. Household income levels show a median of $63,125. The poverty rate stands at 9.38%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$114,583	-
Families	$86,667	$100,512
Households	$63,125	$77,931
Non Families	$37,721	$50,657

$42,667

Average Income

$63,125

Median Household Income

9.38%

Poverty Rate