Lake Petersburg

County:: Cass County
County Seat:: No
Area (mi²):: 1.807
State:: Illinois

Lake Petersburg is a CDP located in Cass County, Illinois. Lake Petersburg has a 2025 population of 774. Lake Petersburg is currently growing at a rate of 0.52% annually and its population has increased by 41.5% since the most recent census, which recorded a population of 547 in 2020.

The average household income in Lake Petersburg is $147,005 with a poverty rate of 0%. The median age in Lake Petersburg is 59 years: 59.5 years for males, and 58 years for females.

Demographics

The racial composition of Lake Petersburg includes 92.2% White, 3.25% Asian, and smaller percentages for Black or African American, Native American, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Asian

Black or African American

Native American

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	709	92.2%
Two or more races	35	4.55%
Asian	25	3.25%
Black or African American	0	0%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

Lake Petersburg Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Lake Petersburg's average per capita income is $59,926. Household income levels show a median of $124,643. The poverty rate stands at 0%.

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	$143,526	-
Families	$143,301	$163,957
Households	$124,643	$147,005
Non Families	-	$78,952

$59,926

Average Income

$124,643

Median Household Income

0%

Poverty Rate