Monmouth, IL Profile: Facts, Map & Data


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Monmouth, Illinois - Basic Facts

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The City of Monmouth had a population of 9,459 as of July 1, 2016. Monmouth ranks in the upper quartile for Population Density and 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 Monmouth is located at latitude 40.9145 and longitude -90.6414 in Warren County. The formal boundaries for the City of Monmouth (see map below) encompass a land area of 4.23 sq. miles and a water area of 0.02 sq. miles. Warren County is in the Central time zone (GMT -6). The elevation is 761 feet.

The City of Monmouth (GNIS ID: 2395371) 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 Monmouth is located within Township of Monmouth, a minor civil division (MCD) of Warren County.

Beneath the boundary map are tables with Monmouth population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Neighborhood Data

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City of Monmouth, IL Boundary Map

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Boundary Maps: Township of Monmouth | Warren County | Illinois Counties

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Monmouth, IL Data & Demographics (As of July 1, 2016)


Total Population 9,459
Population in Households 8,418
Population in Familes 6,533
Population in Group Qrtrs 1,041
Population Density1 2,237
Diversity Index2 51


Total Households 3,526
Average Household Size 2.39
Family Households 2,170
Average Family Size 3


Total Housing Units 3,860 (100%)
Owner Occupied HU 2,296 (59.5%)
Renter Occupied HU 1,230 (31.9%)
Vacant Housing Units 334 ( 8.7%)
Median Home Value $85,263
Average Home Value $112,097


Median Household Income $37,657
Average Household Income $48,126
Per Capita Income $18,258
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.03% 0.17%
Households 0.19% 0.3%
Families 0.22% 0.16%
Median Household Income   1.27%
Per Capita Income   1.66%
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.

Monmouth, IL - Peer Comparisons by Rank and Percentile

The table below compares Monmouth to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2016 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 # 230 83rd
Population Density1 # 224 84th
Diversity Index2 # 168 88th
Median Household Income # 1204 12th
Per Capita Income # 1298 5th

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

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