Rochester Flag

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.

3.9K
Total Population
1,484
Density (mi²)
14 0.36%
Growth

Rochester Population

Rochester Population

Data after 2023 is projected based on recent change

Demographics

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

Population by Race

Race
Population
Percentage (of total)
White3,58594.74%
Asian972.56%
Two or more races872.3%
Black or African American150.4%

Rochester Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

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

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)