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Mill Spring is located in Polk County, North Carolina. There are roughly 4,324 residents, living in 1,792 households. The average temperature for Mill Spring this time of the year is low of 65F and high of 89F. On average, Mill Spring gets about 4.77 inches of precipitation in July. Most residents are home owners (75%), have a high school diploma (51%) and are single, no kids (36%).