Byrnes Mill is located in Jefferson County, Missouri. There are roughly 3,001 residents, living in 1,102 households. The average temperature for Byrnes Mill this time of the year is low of 54F and high of 76F. On average, Byrnes Mill gets about 4.37 inches of precipitation in May. Most residents are home owners (86%), have a post secondary degree (53%) and are married, no kids (34%).
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