Swansea Flag

Swansea

County Seat:
No
Area (mi²):
6.477
State:
Illinois

Swansea is a village located in St. Clair County, Illinois. Swansea has a 2026 population of 14,445. Swansea is currently declining at a rate of -0.56% annually but its population has increased by 0.64% since the most recent census, which recorded a population of 14,353 in 2020.

14.4K
Total Population
2,230
Density (mi²)
-81 -0.56%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)