Duncan is located in Spartanburg County, South Carolina. There are roughly 3,521 residents, living in 1,358 households. The average temperature for Duncan this time of the year is low of 67F and high of 89F. On average, Duncan gets about 4.64 inches of precipitation in July. Most residents are home owners (62%), have a high school diploma (57%) and are single, no kids (38%).
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