Marion, IL Profile: Facts, Map & Data


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Marion, Illinois - Basic Facts

The City of Marion had a population of 17,430 as of July 1, 2017.

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, 2017.

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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, 2017)


Total Population 17,430
Daytime Population: Workers 16,179
Daytime Population: Residents 9,637
Total Daytime Population (TDP) 25,816
Ratio TDP/Total Population1 1.48
Population in Households 16,887
Population in Familes 12,857
Population in Group Qrtrs 543
Population Density2 1,073
Diversity Index3 31


Median Household Income $39,660
Average Household Income $58,803
Per Capita Income $26,500


Total Housing Units 8,516 (100%)
Owner Occupied HU 4,374 (51.4%)
Renter Occupied HU 3,220 (37.8%)
Vacant Housing Units 922 (10.8%)
Median Home Value $95,565
Average Home Value $132,359


Total Households 7,594
Average Household Size 2.22
Family Households 4,510
Average Family Size 3
  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 0.17% 0.25%
Households 0.27% 0.33%
Families 0.11% 0.19%
Median Household Income   0.35%
Per Capita Income   2.16%

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, 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 # 148 89th
Population Density # 713 48th
Diversity Index # 349 74th
Median Household Income # 1187 13th
Per Capita Income # 698 49th

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

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