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 2026 population of 2,124. It is also the county seat of Menard County. Petersburg is currently declining at a rate of -0.75% annually and its population has decreased by -4.28% since the most recent census, which recorded a population of 2,219 in 2020.

The median household income in Petersburg is $56,458 with a poverty rate of 15.7%. The median age in Petersburg is 38.7 years: 33.1 years for males, and 42.2 years for females. For every 100 females there are 89.4 males.

2.1K
Total Population
1,360
Density (mi²)
-16 -0.75%
Growth

Petersburg Population

Petersburg Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20262,124-16-0.75%
20252,140-16-0.74%
20242,156-6-0.28%
20232,162-15-0.69%
20222,177-20-0.91%
20212,197-22-0.99%
20202,219-4-0.18%
20192,229-16-0.71%
20182,24510.04%
20172,244-25-1.1%
20162,26990.4%
20152,260-31-1.35%
20142,291-17-0.74%
20132,308-25-1.07%
20122,333-11-0.47%
20112,344843.72%
20102,342-1-0.04%

Median Age

Overall: 38.7 years
Female: 42.2 years
Male: 33.1 years

Petersburg Adults

There are 1,907 adults, (429 of whom are seniors) in Petersburg.

Sex Ratio

Female: 1,236 (52.8%)
Male: 1,105 (47.2%)

Demographics

The racial composition of Petersburg includes 94.28% White, and smaller percentages for Black or African American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White2,20794.28%
Two or more races1305.55%
Black or African American40.17%
Race
Population ↓
Percentage (of total)
White2,20794.28%
Two or more races1305.55%
Black or African American40.17%

Petersburg Marital Status

Economics and Income Statistics

Petersburg 's average per capita income is $52,730. Household income levels show a median of $56,458. The poverty rate stands at 15.7%.

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$123,859-
Families$81,341$97,342
Households$56,458$93,470
Non Families$31,033$85,348

$52,730

Average Income

$56,458

Median Household Income

15.7%

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)