Rochester Flag

Rochester

County:
Sangamon County
County Seat:
No
Area (mi²):
33.365
State:
Illinois

Rochester is located in Sangamon County, Illinois. Rochester has a 2025 population of 5,794 . Rochester is currently growing at a rate of 2.19% annually and its population has increased by 5.1% since the most recent census, which recorded a population of 5,513 in 2020.

The average household income in Rochester is $139,515 with a poverty rate of 1.51%. The median age in Rochester is 42.7 years: 39.7 years for males, and 44.2 years for females. For every 100 females there are 96.1 males.

5.8K
Total Population
174
Density (mi²)
124 2.19%
Growth

Rochester Population

Rochester Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Rochester includes 95.69% White, and smaller percentages for Two or more races, Asian, Black or African American and multiracial populations.

Population by Race

White (95.69%)

Two or more races (2.02%)

Asian (1.76%)

Black or African American (0.53%)

Race
Population
Percentage (of total)
White5,26695.69%
Two or more races1112.02%
Asian971.76%
Black or African American290.53%

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 $60,888. Household income levels show a median of $112,727. The poverty rate stands at 1.51%.

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$124,569-
Families$121,799$146,104
Households$112,727$139,515
Non Families$57,009$114,314

$60,888

Average Income

$112,727

Median Household Income

1.51%

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)