Marion, IL Profile: Facts, Map & Data


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Marion, Illinois - Basic Facts

The City of Marion had a population of 17,185 as of July 1, 2016.

The primary coordinate point for Marion is located at latitude 37.7161 and longitude -88.9257 in Williamson County. The formal boundaries for the City of Marion (see map below) encompass a land area of 16.24 sq. miles and a water area of 0.23 sq. miles. Williamson County is in the Central time zone (GMT -6). The elevation is 427 feet.

The City of Marion (GNIS ID: 2395010) 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 Marion is located within East Marion Election Precinct, a minor civil division (MCD) of Williamson County.

Beneath the boundary map are tables with Marion 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 Marion, IL Boundary Map

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Boundary Maps: East Marion Election Precinct | Williamson County | Illinois Counties

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


Total Population 17,185
Population in Households 16,643
Population in Familes 12,680
Population in Group Qrtrs 542
Population Density1 1,058
Diversity Index2 29


Total Households 7,492
Average Household Size 2.22
Family Households 4,463
Average Family Size 3


Total Housing Units 8,433 (100%)
Owner Occupied HU 4,350 (51.6%)
Renter Occupied HU 3,142 (37.3%)
Vacant Housing Units 941 (11.2%)
Median Home Value $93,622
Average Home Value $127,540


Median Household Income $38,619
Average Household Income $55,445
Per Capita Income $25,071
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population -0.03% 0.09%
Households 0.09% 0.15%
Families -0.04% 0.03%
Median Household Income   -1.96%
Per Capita Income   0.86%
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.

Marion, IL - Peer Comparisons by Rank and Percentile

The table below compares Marion 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 # 150 89th
Population Density1 # 721 47th
Diversity Index2 # 365 73rd
Median Household Income # 1178 14th
Per Capita Income # 743 46th

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

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