Rochester

County:: Sangamon County
County Seat:: No
Area (mi²):: 2.646
State:: Illinois

Rochester is a village located in Sangamon County, Illinois. Rochester has a 2025 population of 3,926. Rochester is currently growing at a rate of 0.36% annually and its population has increased by 1.76% since the most recent census, which recorded a population of 3,858 in 2020.

The average household income in Rochester is $132,375 with a poverty rate of 2.13%. The median age in Rochester is 39.2 years: 36.7 years for males, and 43 years for females.

Demographics

The racial composition of Rochester includes 94.74% White, and smaller percentages for Asian, Two or more races, Black or African American, Native American, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Asian

Two or more races

Black or African American

Native American

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	3,585	94.74%
Asian	97	2.56%
Two or more races	87	2.3%
Black or African American	15	0.4%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

Rochester Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Rochester's average per capita income is $65,101. Household income levels show a median of $112,689. The poverty rate stands at 2.13%.

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	$125,313	-
Families	$120,217	$141,314
Households	$112,689	$132,375
Non Families	-	$94,995

$65,101

Average Income

$112,689

Median Household Income

2.13%

Poverty Rate