Lake Petersburg Flag

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.

774
Total Population
428
Density (mi²)
4 0.52%
Growth

Lake Petersburg Population

Lake Petersburg Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Lake Petersburg includes 92.2% White, 3.25% Asian, and smaller percentages for and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White70992.2%
Two or more races354.55%
Asian253.25%

Lake Petersburg Marital Status

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

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

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)