Lake Petersburg, IL Profile: Facts, Map & Data


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Lake Petersburg, Illinois - Basic Facts

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The Lake Petersburg Census Designated Place had a population of 665 as of July 1, 2017. Lake Petersburg ranks in the lower quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Lake Petersburg is located at latitude 39.9788 and longitude -89.8525 in Menard County. The formal boundaries for the Lake Petersburg Census Designated Place (see map below) encompass a land area of 1.76 sq. miles and a water area of 0.28 sq. miles. Menard County is in the Central time zone (GMT -6). The elevation is 597 feet.

The Lake Petersburg Census Designated Place (GNIS ID: 2629866) has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

The Lake Petersburg Census Designated Place is located within Petersburg South Number 15 Election Precinct, a minor civil division (MCD) of Menard County.

Beneath the boundary map are tables with Lake Petersburg population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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Lake Petersburg Census Designated Place, IL Boundary Map

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Boundary Maps: Petersburg South Number 15 Election Precinct | Menard County | Illinois Counties

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Lake Petersburg, IL Data & Demographics (As of July 1, 2017)


Total Population 665
Daytime Population: Workers 31
Daytime Population: Residents 357
Total Daytime Population (TDP) 388
Ratio TDP/Total Population1 0.58
Population in Households 665
Population in Familes 597
Population in Group Qrtrs 0
Population Density2 377
Diversity Index3 9


Median Household Income $87,689
Average Household Income $116,379
Per Capita Income $52,656


Total Housing Units 387 (100%)
Owner Occupied HU 294 (76.0%)
Renter Occupied HU 16 ( 4.1%)
Vacant Housing Units 78 (20.2%)
Median Home Value $214,433
Average Home Value $213,095


Total Households 309
Average Household Size 2.15
Family Households 246
Average Family Size 2
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population -1.07% -0.95%
Households -0.86% -0.79%
Families -0.6% -0.91%
Median Household Income   1.57%
Per Capita Income   1.68%

Lake Petersburg, IL - Peer Comparisons by Rank and Percentile

The table below compares Lake Petersburg to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 838 39th
Population Density # 1152 16th
Diversity Index # 974 29th
Median Household Income # 114 92nd
Per Capita Income # 45 97th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

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