Plaquemine is a city in and the parish seat of Iberville Parish, Louisiana, United States. It is part of the Baton Rouge metropolitan statistical ar…Plaquemine is a city in and the parish seat of Iberville Parish, Louisiana, United States. It is part of the Baton Rouge metropolitan statistical area. At the 2010 United States census, the population was 7,119; the 2020 census determined its population was 6,269.
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