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 2026 population of 781. Lake Petersburg is currently growing at a rate of 0.51% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.

The median household income in Lake Petersburg is $144,375 with a poverty rate of 2.69%. The median age in Lake Petersburg is 60.8 years: 62 years for males, and 59.5 years for females. For every 100 females there are 113.8 males.

781
Total Population
432
Density (mi²)
4 0.51%
Growth

Lake Petersburg Population

Lake Petersburg Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202678140.51%
202577740.52%

Median Age

Overall: 60.8 years
Female: 59.5 years
Male: 62 years

Lake Petersburg Adults

There are 837 adults, (349 of whom are seniors) in Lake Petersburg.

Sex Ratio

Female: 434 (46.8%)
Male: 494 (53.2%)

Demographics

The racial composition of Lake Petersburg includes 100% White, and smaller percentages for and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White928100%
Race
Population ↓
Percentage (of total)
White928100%

Lake Petersburg Marital Status

Economics and Income Statistics

Lake Petersburg 's average per capita income is $65,156. Household income levels show a median of $144,375. The poverty rate stands at 2.69%.

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
Families$145,597$164,608
Married Families$145,597-
Households$144,375$157,076
Non Families-$104,921

$65,156

Average Income

$144,375

Median Household Income

2.69%

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)