Swansea, IL Profile: Facts, Map & Data


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Swansea, Illinois - Basic Facts

The Village of Swansea had a population of 13,938 as of July 1, 2016. Swansea 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 Swansea is located at latitude 38.5518 and longitude -89.9875 in St. Clair County. The formal boundaries for the Village of Swansea (see map below) encompass a land area of 6.29 sq. miles and a water area of 0.15 sq. miles. St. Clair County is in the Central time zone (GMT -6). The elevation is 545 feet.

The Village of Swansea (GNIS ID: 2399939) 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 Village of Swansea is located within Township of Saint Clair, a minor civil division (MCD) of St. Clair County.

Beneath the boundary map are tables with Swansea 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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Village of Swansea, IL Boundary Map

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Boundary Maps: Township of Saint Clair | St. Clair County | Illinois Counties

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


Total Population 13,938
Population in Households 13,554
Population in Familes 11,035
Population in Group Qrtrs 384
Population Density1 2,215
Diversity Index2 40


Total Households 5,577
Average Household Size 2.43
Family Households 3,637
Average Family Size 3


Total Housing Units 5,909 (100%)
Owner Occupied HU 4,133 (69.9%)
Renter Occupied HU 1,444 (24.4%)
Vacant Housing Units 332 ( 5.6%)
Median Home Value $146,502
Average Home Value $186,517


Median Household Income $60,785
Average Household Income $85,232
Per Capita Income $35,464
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.48% 0.06%
Households 0.52% 0.09%
Families 0.3% -0.01%
Median Household Income   1.71%
Per Capita Income   1.35%
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.

Swansea, IL - Peer Comparisons by Rank and Percentile

The table below compares Swansea 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 # 175 87th
Population Density1 # 230 83rd
Diversity Index2 # 245 82nd
Median Household Income # 377 73rd
Per Capita Income # 172 88th

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

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