Swansea is located in Saint Clair County, Illinois. There are roughly 12,851 residents, living in 5,202 households. The average temperature for Swansea this time of the year is low of 68F and high of 89F. On average, Swansea gets about 3.82 inches of precipitation in July. Most residents are home owners (73%), have a post secondary degree (57%) and are single, no kids (41%).
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