Marengo, IL Profile: Facts, Map & Data


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Marengo, Illinois - Basic Facts

The City of Marengo had a population of 7,784 as of July 1, 2015. Marengo ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Marengo is located at latitude 42.2473 and longitude -88.6063 in McHenry County. The formal boundaries for the City of Marengo (see map below) encompass a land area of 5 sq. miles and a water area of 0 sq. miles. McHenry County is in the Central time zone (GMT -6). The elevation is 833 feet.

The City of Marengo (GNIS ID: 2395004) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Marengo is located within Township of Marengo, a minor civil division (MCD) of McHenry County.

Beneath the boundary map are tables with Marengo population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2015.

Alternate Unofficial Names for Marengo: Pleasant Grove.

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.


City of Marengo, IL Boundary Map

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Boundary Maps: Township of Marengo | McHenry County | Illinois Counties

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Marengo, IL Data & Demographics (As of July 1, 2015)


Total Population 7,784
Population in Households 7,738
Population in Familes 6,489
Population in Group Qrtrs 46
Population Density1 1,554
Diversity Index2 44


Total Households 2,840
Average Household Size 2.72
Family Households 2,024
Average Family Size 3


Total Housing Units 3,103 (100%)
Owner Occupied HU 1,994 (64.3%)
Renter Occupied HU 846 (27.3%)
Vacant Housing Units 263 ( 8.5%)
Median Home Value $158,851
Average Home Value $172,403


Median Household Income $61,013
Average Household Income $73,145
Per Capita Income $26,739
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.34% 1.42%
Households 0.37% 1.43%
Families 0.58% 1.37%
Median Household Income   4.01%
Per Capita Income   2.51%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.


Marengo, IL - Peer Comparisons by Rank and Percentile

The table below compares Marengo to the other 1,367 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2015 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 # 263 81st
Population Density1 # 446 67th
Diversity Index2 # 217 84th
Median Household Income # 391 71st
Per Capita Income # 531 61st

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