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 2,155. It is also the county seat of Menard County. Petersburg is currently declining at a rate of -0.97% annually and its population has decreased by -4.65% since the most recent census, which recorded a population of 2,260 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.

Demographics

The racial composition of Petersburg includes 94.63% White, and smaller percentages for Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	2,451	94.63%
Two or more races	131	5.06%
Black or African American	8	0.31%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

Petersburg Marital Status

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