With 14,710 people, Swansea is a city in Illinois. Few US cities rank higher on income. The population is up 39% since 2000. The foreign-born share is 4%. At a median age of 42.3, this is an older place than the country as a whole. Density works out to 2,271 people per square mile.
At a glance
Wealthier
median household income $91,587, above the US median
US median: $82,259
Older
median age 42.3
US median: 38.9
More educated
42% hold a bachelor's degree
US average: 36%
Stable housing
home values roughly flat, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Swansea
What changed most since 1990
Black share4.5% → 19.2%(+14.7 pts)US over the same years: +0.2 pts
Adults with a bachelor's degree16.3% → 42.5%(+26.2 pts)US over the same years: +15.3 pts
Median home value (2024 dollars)$189,365 → $223,600(+18%)US over the same years: +67%
Swansea's population equals 5.8% of St. Clair County's. Its number of residents living in poverty equals 3.7% of the county's. Its number of households without a car equals 3.7% of the county's.
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)24%(269)
US avg: 26.4%
Gulf War (1990s)51.2%(573)
US avg: 24.3%
Vietnam era34.6%(387)
US avg: 33.1%
Korean War1.6%(18)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 1,119 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Swansea, decade by decade
Swansea population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
8,201
$74,767
$189,365
16.3%
17.9
2000
10,579
$90,811
$183,441
27.4%
29.4
2010
13,430
$89,105
$236,933
33.5%
47.3
2020
14,386
$98,933
$202,653
43.9%
65.9
2024
14,710
$91,587
$223,600
42.5%
58.1
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
