Rochester Flag

Rochester

County:
Sangamon County
County Seat:
No
Area (mi²):
2.683
State:
Illinois

Rochester is a village located in Sangamon County, Illinois. Rochester has a 2026 population of 4,134. Rochester is currently growing at a rate of 1.1% annually and its population has increased by 6.99% since the most recent census, which recorded a population of 3,864 in 2020.

The median household income in Rochester is $117,118 with a poverty rate of 2.51%. The median age in Rochester is 39.8 years: 38.1 years for males, and 45.2 years for females. For every 100 females there are 102.0 males.

4.1K
Total Population
1,541
Density (mi²)
45 1.1%
Growth

Rochester Population

Rochester Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20264,134451.1%
20254,089451.11%
20244,0441253.19%
20233,919601.55%
20223,859-3-0.08%
20213,862-2-0.05%
20203,864-1-0.03%
20193,728-13-0.35%
20183,741-20-0.53%
20173,761-15-0.4%
20163,776-13-0.34%
20153,78930.08%
20143,78640.11%
20133,782-4-0.11%
20123,786180.48%
20113,768431.15%
20103,725360.98%
20002,8932178.11%
19902,67600%

Median Age

Overall: 39.8 years
Female: 45.2 years
Male: 38.1 years

Rochester Adults

There are 2,842 adults, (721 of whom are seniors) in Rochester.

Sex Ratio

Female: 1,864 (49.5%)
Male: 1,902 (50.5%)

Demographics

The racial composition of Rochester includes 92.22% White, and smaller percentages for Asian, Black or African American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White3,47392.22%
Two or more races1584.2%
Asian782.07%
Black or African American571.51%
Race
Population ↓
Percentage (of total)
White240.64%
Two or more races140.37%
Race
Population ↓
Percentage (of total)
White3,44991.58%
Two or more races1443.82%
Asian782.07%
Black or African American571.51%

Rochester Marital Status

Economics and Income Statistics

Rochester 's average per capita income is $65,353. Household income levels show a median of $117,118. The poverty rate stands at 2.51%.

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$128,125-
Families$126,490$135,798
Households$117,118$127,713
Non Families$102,440$104,163

$65,353

Average Income

$117,118

Median Household Income

2.51%

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)