Petersburg Flag

Petersburg

County:
Menard County
County Seat:
Yes
Area (mi²):
1.562
State:
Illinois

Petersburg is a city located in Menard County, Illinois. Petersburg has a 2025 population of 2,140 . It is also the county seat of Menard County . Petersburg is currently declining at a rate of -0.74% annually and its population has decreased by -3.56% since the most recent census, which recorded a population of 2,219 in 2020.

The average household income in Petersburg is $86,349 with a poverty rate of 15.46%. The median age in Petersburg is 38.8 years: 35.2 years for males, and 41 years for females. For every 100 females there are 87.0 males.

2.1K
Total Population
1,370
Density (mi²)
-16 -0.74%
Growth

Petersburg Population

Petersburg Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Petersburg includes 94.63% White, and smaller percentages for Black or African American and multiracial populations.

Population by Race

White (94.63%)

Two or more races (5.06%)

Black or African American (0.31%)

Race
Population
Percentage (of total)
White2,45194.63%
Two or more races1315.06%
Black or African American80.31%

Petersburg Marital Status

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

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Petersburg's average per capita income is $49,732. Household income levels show a median of $59,850. The poverty rate stands at 15.46%.

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$117,930-
Families$78,917$90,821
Households$59,850$86,349
Non Families$28,153$76,893

$49,732

Average Income

$59,850

Median Household Income

15.46%

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)